Peter sold two flats for$999999each. He lost 10% on one and gained10% on the other. Find Peter's gain or loss after the two transactions
change in his assets;
999999*2-999999/(1-10%)+999999/(1+10%)
=-$20202
He lost $20202
我唔明ＷＨＹ係除（１－１０％）＆（１＋１０％）
F.3 Maths (percentage)1條5點
2011-10-12 6:20 am
回答 (2)
2011-10-12 11:52 pm
✔ 最佳答案
Let C be the cost; S be the selling price(1) 10% gain :
(S-C)/C X 100% = 10%
S-C = (10%)C
S = C + (10%)C
S = C(1+10%)
C = S / (1+10%)
(2) 10% lost :
(C - S)/C X 100% = 10%
C - S = (10%)C
C - (10%)C = S
C (1-10%) = S
C = S / (1-10%)
2011-10-12 6:45 am
first of all, the question states that He lost 10% on one
which means he "lost" money rather than gain!
as a result, it should be 100%-10% or 1-0.1
(100%=100/100 = 1 and 10% = 10/100= 0.1)
then he gain 10% from the other flat
so it should be "+" not "-"
therefore, it is 100%+10% or 1+0.1
which means he "lost" money rather than gain!
as a result, it should be 100%-10% or 1-0.1
(100%=100/100 = 1 and 10% = 10/100= 0.1)
then he gain 10% from the other flat
so it should be "+" not "-"
therefore, it is 100%+10% or 1+0.1
收錄日期: 2021-04-21 12:42:05
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