Question
A Man deposited certain amount in the Bank at the end of
each year. How much amount did he deposited at the end of each year at the rate of 15% simple Interest, so that he will get Rs. 980 at the end of 4th year?Solution
Let the amount be 100 units Interest = 15% 
Total Interest = 45 + 30 + 15 + 0 = 90 Total Amount = 400 + 90 = 490 units 490 units = 980 1 unit = 200 Formula Method :- Formula for Annual Payment/ Annual Income / Annual Installment = (Due Debt ×100)/(100 ×t+ (r × t ×(t-1) )/2) = (980 ×100)/(100 ×4+ (15 × 4 ×(4-1) )/2) = 98000/(400+90) = 200
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