Question

A sum becomes $4800 after two years and $6400
after four years at compound interest per annum
compounded annually. The sum is
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Answer 1

Answer:

let sum be p

then it becomes 4800 in 2 yr and 6400 in 4 yr

so if we multiply 4800 by 4/3 we get 6400

similarly p*4/3=4800

p=4800*3/4=3600