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WAEC Mathematics 2010 Paper

Question : 25

Total: 49

Solution:

Concept:

Selling price equals cost price plus profit, so it is

115\%

of cost price when profit is

15\%

Explanation:

Given original S.P.

= N6900

and profit

= 15\%

Therefore,

\text{S.P.} = \text{C.P.} \times \frac{115}{100}

6900 = \text{C.P.} \times 1.15

\text{C.P.} = \frac{6900}{1.15} = N6000

For the new selling price

= N6600

\text{S.P.} - \text{C.P.} = 6600 - 6000 = N600

Since new selling price is greater than cost price, it is a profit.

Profit percent

= \frac{600}{6000} \times 100\% = 10\%

Answer:

He would make a profit of

10\%

. Hence, none of the provided options is correct.

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