Txoj Kev Sai Sai Los Daws Cov Teeb Meem Feem Pua
Feem pua yog ib lub tswv yim lej uas peb feem ntau ntsib hauv lub neej txhua hnub, ob qho tib si hauv kev kawm thiab hauv cov xwm txheej xws li luv nqi yuav khoom, paj laum hauv txhab nyiaj, lossis cov txiaj ntsig ntawm kev soj ntsuam. Txawm hais tias nws yuav zoo li yooj yim, qee tus neeg yuav muaj teeb meem daws cov teeb meem feem pua sai thiab raug. Tsab xov xwm no lub hom phiaj yog muab txoj hauv kev sai thiab zoo los daws cov teeb meem feem pua, nrog cov kauj ruam yooj yim ua raws thiab piv txwv kom koj nkag siab tob dua.
1. Nkag Siab Txog Cov Ntsiab Lus Tseem Ceeb ntawm Feem Pua
Ua ntej yuav tham txog tej yam yooj yim, nws yog ib qho tseem ceeb uas yuav tsum nkag siab txog cov hauv paus ntawm feem pua. Feem pua yog qhov sib piv ntawm ib qho nyiaj rau 100. Piv txwv li, 25% yog 25 ntawm 100, lossis 25/100. Feem pua feem ntau yog siv los piav qhia tias tus nqi ntau npaum li cas piv rau tag nrho.
Cov Qauv Feem Pua Yooj Yim:
1. Feem pua (P) = (Qhia / Tag Nrho) × 100%
2. Feem = (Feem pua × Tag Nrho) / 100
3. Tag Nrho = Feem pua / (Feem pua / 100)
Thaum koj paub siv cov qauv yooj yim no, koj yuav muaj lub hauv paus ruaj khov rau kev daws ntau hom teeb meem feem pua.
2. Txheeb Xyuas Hom Lus Nug
Cov lus nug feem pua feem ntau tuaj yeem muab faib ua ntau hom:
1. Txheeb Xyuas Feem Pua: Nrhiav seb feem pua ntawm tag nrho yog pes tsawg.
2. Txheeb Xyuas Feem ntawm Tag Nrho: Txheeb xyuas tus nqi tshwj xeeb raws li feem pua uas tau muab.
3. Txheeb Xyuas Tag Nrho: Txheeb xyuas tus nqi tag nrho yog tias paub cov feem thiab feem pua.
4. Feem Pua Nce Los Yog Txo: Xam qhov feem pua hloov ntawm tus nqi pib mus rau tus nqi kawg.
Kev paub txog hom teeb meem uas koj tab tom ntsib yuav pab koj xaiv txoj kev daws teeb meem zoo.
3. Siv Cov Qauv Sai Sai
Kev Txheeb Xyuas Feem Pua
Rau cov lus nug uas nug txog feem pua, siv cov qauv:
\[ P = \left(\frac{\text{Ib Feem}}{\text{Tag Nrho}}\right) \times 100\]
Piv txwv:
Muaj pes tsawg feem pua yog 25 ntawm 200?
Sau cov nqi rau hauv tus qauv:
\[ P = \left(\frac{25}{200}\right) \times 100 = 12.5\% \]
Txiav Txim Siab Feem ntawm Tag Nrho
Siv cov mis ncaj qha:
\[ \text{Ib Feem} = \left(\frac{P \times \text{Tag Nrho}}{100}\right) \]
Piv txwv:
Yog tias paub tias 20% ntawm ib tus lej yog 50, tus lej tag nrho yog dab tsi?
Siv cov mis los txiav txim siab qhov feem:
\[ 50 = \left(\frac{20 \times \text{Tag Nrho}}{100}\right) \]
\[
\text{Tag Nrho} = \left(\frac{50 \times 100}{20}\right) = 250
\]
Kev Txheeb Xyuas Tag Nrho
Siv cov mis inverse ntawm qhov seem:
\[ \text{Tag Nrho} = \left(\frac{\text{Ib Feem}}{\left(\frac{P}{100}\right)}\right) \]
Piv txwv:
Yog tias 15% ntawm tus nqi ntawd yog 60, tag nrho tus nqi yog dab tsi?
Sau cov nqi rau hauv tus qauv:
\[ \text{Tag Nrho} = \left(\frac{60}{0.15}\right) = 400 \]
Feem Pua Nce lossis Txo
Xam qhov feem pua ntawm kev hloov pauv siv cov mis:
\[ \text{Feem Pua Nce/Txo} = \left(\frac{\text{Tus Nqi Kawg} - \text{Tus Nqi Pib}}{\text{Tus Nqi Pib}}\right) \times 100\]
Piv txwv:
Tus nqi pib ntawm ib yam khoom yog Rp 200.000, tom qab ntawd nws nce mus txog Rp 250.000. Qhov feem pua ntawm tus nqi ntawm yam khoom nce yog dab tsi?
Sau cov nqi rau hauv tus qauv:
\[ \text{Feem Pua Nce} = \left(\frac{250.000 – 200.000}{200.000}\right) \times 100 = 25\% \]
4. Siv Cov Tswv Yim Hauv Siab
Ntxiv rau kev siv cov qauv, muaj qee cov tswv yim hauv hlwb uas yuav pab koj daws cov teeb meem feem pua sai sai yam tsis tas yuav sau txhua kauj ruam ntawm kev xam.
10% Kev Ua Si
Kev paub 10% ntawm ib tus lej yog qhov pab tau heev vim tias nws tuaj yeem yooj yim muab sib npaug lossis rho tawm los txiav txim siab lwm feem pua.
Piv txwv:
Yuav nrhiav tau 30% ntawm 400, ua ntej txiav txim siab seb 10% ntawm 400 yog 40. Tom qab ntawd muab 40 ntxiv rau 3 (vim 30% yog peb npaug 10%):
\[ 30\% \times 400 = 40 \times 3 = 120 \]
Cov Kev Qhia Txog Feem
Kev hloov feem pua mus ua feem pua tuaj yeem ua rau kev suav sai dua.
– 50% = ½
– 25% = ¼
– 20% = ⅕
– 10% = 1/10
– 5% = 1/20
Piv txwv:
Yuav nrhiav tau 25% ntawm 320, siv:
\[ 25\% = \frac{1}{4} \]
\[ \frac{1}{4} \times 320 = 80 \]
Kev sib npaug
Qee zaum, kev suav cov nqi tuaj yeem ua kom cov kev suav nrawm dua yam tsis muaj qhov poob qis ntawm qhov tseeb.
Piv txwv:
Yuav nrhiav tau 18% ntawm 465, koj tuaj yeem puag ncig 465 mus rau 470:
\[ 18\% \times 470 = 0.18 \times 470 = 84.6 \]
Tus lej no ze rau qhov tshwm sim tiag tiag ntawm 83.7.
5. Cov Lus Nug Xyaum
Nov yog qee cov lus nug xyaum ua kom koj nkag siab tob dua:
Lo lus nug thib 1:
Ib yam khoom uas muaj tus nqi pib ntawm Rp 150.000 raug muag luv nqi 15%. Tus nqi tom qab luv nqi yog dab tsi?
Kev daws teeb meem:
Tus nqi luv nqi:
\[ 15\% \x150.000 = 22.500 \]
Tus nqi tom qab luv nqi:
\[ 150.000 – 22.500 = 127.500 \]
Lo lus nug thib 2:
Yog tias paub tias tag nrho cov tub ntxhais kawm hauv ib lub tsev kawm ntawv yog 800 tus thiab 35% ntawm cov tub ntxhais kawm yog poj niam, muaj pes tsawg tus tub ntxhais kawm poj niam?
Kev daws teeb meem:
Tus naj npawb ntawm cov tub ntxhais kawm poj niam:
\[ 35\% \x800 = 280 \]
Lo lus nug thib 3:
Cov nyiaj tau los ntawm lub tuam txhab tau nce ntxiv ntawm Rp 2.000.000 mus rau Rp 2.500.000. Cov nyiaj tau los nce ntxiv yog pes tsawg feem pua?
Kev daws teeb meem:
Feem pua nce ntxiv:
\[ \frac{2.500.000 – 2.000.000}{2.000.000} \times 100 = 25\% \]
Xaus
Los ntawm kev nkag siab txog cov hauv paus ntawm feem pua, txheeb xyuas cov hom teeb meem, siv cov qauv raug, thiab siv cov tswv yim hauv siab thiab kev xyaum tas li, koj tuaj yeem daws cov teeb meem feem pua sai thiab raug. Cov txheej txheem piav qhia hauv tsab xov xwm no yog tsim los ua kom kev suav feem pua yooj yim dua thiab ua haujlwm tau zoo dua. Peb vam tias tsab xov xwm no yuav pab tau thiab pab koj daws ntau yam teeb meem feem pua, ob qho tib si hauv kev xeem thiab hauv lub neej txhua hnub.
