A person purchases 90 clocks and sells 40 clocks at a gain of 10% and 50 clocks at a gain of 20%. If he sold all of them at a uniform profit of 15%, then he would have got Rs. 40 less. The cost price of each clock is:_________?
Correct Answer: C. P. of 90 clocks = Rs. 90x. [(110% of 40x) + (120% of 50x)] – (115% of 90x) = 40 44x + 60x – 103.5x = 40 0.5x = 40 => x = 80
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