If the simple interest on a certain principal at 5 percent per annum for 5 years is Rs. 900 more than the simple interest on the same principal for 4 years at 4 percent per annum, then find the principal amount.
ARs. 9,000
BRs. 10,500
CRs. 10,000 ✓ Correct
DRs. 12,000
Correct answer: (C) Rs. 10,000
Explanation
The principal is Rs. 10,000.
SI at 5% for 5 years = P x 5 x 5 / 100 = 0.25P.
SI at 4% for 4 years = P x 4 x 4 / 100 = 0.16P.
Difference: 0.25P - 0.16P = 0.09P = 900.
P = 900/0.09 = 10,000.
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