a sum compounded annually becomes 729/512 times of itself in 3 years.find the rate of interest per annum
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Answer:
let us assume that the number of coins of 1 rupee are x
therefore coins of 50 paisa are 3x
amount of 1 rupee coin = 1×x=100x paisa
amount of 50 paisa coins=50×3x=150 paisa
100x+150x=4500
250x=4500
x=18
hope it helps you.......................
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