GMAT Quantitative Reasoning Practice Test 1

Question : 28 of 100

Marks: +1, -0

The price of a product is

\$ a

. Bill bought

s

products and then sold 80 percent of them

\$ b

. Which of the following represents the whole deal if Bill's profit was three times the cost?

$0.8 s b=4 s a$
$(1-0.8) s-a b=3 s$
$3(0.8 a-s b)=s a$
$(s-0.8 s)(b-a)=3$
$(s 0.8 s) \/(b-a)=3$

Solution:

This statement is equivalent to

0.8 s b-s a=3 s a

. The income is

0.8 s b

, the cost is sa, so the profit is three times the cost.

\;0.8 s b-s a=3 s a

\;0.8 s b=4 s a

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