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Sunday, November 19 2017 @ 11:34 AM CST
 Forum Index >  Test Paper Related >  Primary 6 Matters
 P6 percentage
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By: JessicaTan (offline)  Wednesday, August 28 2013 @ 04:28 AM CDT (Read 549 times)  
JessicaTan

Hi please help with working solution
Attached with file

Thanks
Jessica

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By: echeewh (offline)  Wednesday, August 28 2013 @ 05:38 AM CDT  
echeewh

Hi Jessica,

I believe this question is from Rosyth 2012 Prelim Q17.

Following is my worked solution:

<Contributions of P,J,B>
P: 25%
J: 30% of Remaining = (30/100) × 75 = 22.5%
B: 100 - 25 - 22.5 = 52.5%

<Cost of present increased by 20%>
B: $100.80

52.5% = 10080
100% = (10080 / 52.5) × 100 = 19200 = $192 {cost of present after increase of 20%}

(a)
Original price of present = 100%

120% = 192
100% = (192 / 120) × 100 = $160

(b)
At the end,
J = (22.5 / 100) × 192 = $43.20

==========

Trust this helps.

Do let me know again if there's further clarification.

Cheers,
Edward

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