Syntel Company Numerical Ability Simple & Compound Interest

Peter deposits an amount with a bank in the fixed deposit which offers an interest compounded annually. John
deposits the same amount with the same bank but in the savings scheme where he gets the same interest rate as
Peter but is not compounded. What would be the ratio of the sum that John gets after 6 years to that Peter gets
then?

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Syntel Other Question

Find the rate of compound interest if an amount doubles in 4 years. Andy and Brad can finish a piece if work in 12 and 9 days respectively. They start off together and Andy leaves
on the third day. How many days more would Brad take to complete the work?