1.

1). 20%2). 17%3). 21½%4). 25%

Answer»

TOTAL C.P of 120 chalks = 120 × 10 = 1200

Now total C.P of 60 chalks = 600

S.P = C.P + profit

S.P = 600 + 15 × 600/100

S.P = 600 + 90 = 690

Now for a total gain of 20%, Total S.P = 1200 + 20% of 1200

Total S.P = 1200 + 20/100 of 1200

Total S.P = 1200 + 240 = 1440

60 chalks are sold at S.P of 690

Hence so as to make a overall gain of 20%, S.P of remaining 60 chalks should be = (1440 – 690) = 750

Hence profit made on other 60 chalks = 750 – 600 = 150

% gain = 150 × 100/600 = 25% 



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