A market woman sells oil in cylindrical tins 10cm deep and 6cm in diameter at...

JAMB 1998

A market woman sells oil in cylindrical tins 10cm deep and 6cm in diameter at N15.00 each. If she bought a full cylindrical jug 18cm deep and 10cm in diameter for N50.00, how much did she make by selling all the oil?

A. N62.50
B. N35.00
C. N31.00
D. N25.00

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Correct Answer: Option D

Explanation

V\(\pi\)r²h = \(\pi\)(3)²(10) = 90\(\pi\)cm³

V = \(\pi\)(5)² x 18 = 450\(\pi\)cm³

No of volume = \(\frac{450\pi}{90\pi}\)

= 5

selling price = 5 x N15 = N75

profit = N75 - N50 = N25.00

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