Book Maths Puzzle

Mohan makes fixed deposit of Rs. 20000 in Punjab National Bank for a period of 1 year. What amount will he get on maturely if the rate of inerest is 8% per annum compounded half-year ?

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Book Other Question

In what time will the C.I. on Rs 2000 at 6% p.a. be Rs. 247.20? If {x+1/x}=9, find the value of {x^2+1?x^2}.