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:_________?

A. Rs.50
B. Rs.60
C. Rs.80Correct Answer
D. Rs.90
Correct Option: C. Rs.80

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