1.

 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 uniform profit of 15%, then he got Rs. 40 less. The cost price of each clock is:

A. Rs. 79
B. Rs. 80
C. Rs. 81
D. Rs. 82
Answer» C. Rs. 81


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