F.3 Percentage

1. cost price=2000/(1.4)selling price=$2000/1.4=$1428.571
selling price= 2000*0.85=1700
profit%=[(1700-1428.571)/1428.571]*100% = 19.0 %(cor.to 3 sig.fig.)
2. mr.chan s interest= P(1+10/100)^2-P=0.21
mr.wong s interest=P(1+5/100)^4-P=0.216 (cor.to 3 sig.fig.)
So mr.wong earns a larger amount of interest.

2013-10-12 23:23:44 補充：
cost price =1428.571 just i miss this

2013-10-12 23:24:42 補充：
sorry selling price is 2000 *0.85= 1700, so sorry!!! ^^

2013-10-12 23:25:21 補充：
nothing

2013-10-13 00:56:39 補充：
yea....i still cannot adapt to the time differences when coming back from England...a very strange feeling ...OMG!!!

2013-10-13 09:16:53 補充：
yay...thats great

Nice answer~
Your home town is England? I see~

For question 1, actually the answer of 19% is exact.

Cost = $2000/1.4
Selling Price = $2000 * (1-15%) = $1700

Profit % = [1700 - 2000/1.4]/(2000/1.4) * 100% = 19% (exact)

2013-10-13 01:47:55 補充：
Keep waking up in the morning and the jet lag would be gone soon.

I previously thought that you were born in Hong Kong.

Nice to meet you~

Then we have different members here internationally.