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A certain sum is invested for T year.it amounts to Rs.400 at 10% simple interest per annum.But when invested at 4% simple interest per annum, it amounts to Rs.200.Then time(T) is:
9 years ago

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Steve
x(1+.10*t)=400
x(1+.04*t)=200

Now just solve for t
9 years ago

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