Question

on a certain sum, the simple interest at the end of 12(1/2)years is 3/4of the sum. what is the rate percent per annum?​

Answer 1

Answer:

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boat covers a certain distance downstream in 3/2 hours. It covers the same distance

upstream in 2 hours. The speed of the boat in still water is 35 km/hr. Find the speed of stream.