BECE Mathematics 2020 Paper

Profit = Selling Price - Cost Price
Profit Percent = Profit/Cost Price x 100
Since Profit = Selling Price - Cost Price, substituting it in the second equation,
Profit Percent = (Selling Price - Cost Price)/Cost Price × 100
Profit percent = 8
Selling Price = 72
Let Cost Price = CP
⇒8=(72−CP)∕CP×100
⇒8=(72−CP)∕CP×100
Multiplying both sides by CP
‌8×CP=(72−CP)×100
‌(72−CP)×100=72×100−CP×100=7200−100CP
‌8×CP=(72−CP)×100⇒
‌8CP=7200−100CP
Moving the -100 CP to the left size ⇒
‌8CP+100CP=7200
‌108CP=7200
Dividing both sides by 108
CP=7200∕108=66.666667=67‌ (Nearest whole number) ‌