The bankers discount and the true discount of a sum at 10% per annum simple interest for the same time are Rs.100 and Rs.80 respectively. What is the sum and the time?

Sum = Rs.400 and Time = 5 years

Sum = Rs.200 and Time = 2.5 years

Sum = Rs.400 and Time = 2.5 years

Sum = Rs.200 and Time = 5 years

Correct Answer : C

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