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प्रश्न
Sachin opened a cumulative time deposit account with Punjab National Bank for 3/2 years. If the rate of interest is 11% per annum and the bank pays 11740.50 on maturity, find how much did Sachin deposit each month?
बेरीज
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उत्तर
Given:
Time = `3/2 = 1.5` years
n = 1.5 × 12
= 18 months
Rate of interest r = 11% per annum
Maturity amount A = ₹ 11740.50
Monthly deposit = P
RD Maturity Amount
`A = Pn + (Pxxn(n+1))/2 xx r/(12xx100)`
`11740.50 = 18P + (18xx19)/2 xx 11/1200xxP`
`(18xx19)/2`
= 171
`171xx11/1200`
= 171 × 0.009166 ...
= 1.5685
11740.50 = 18P + 1.5685P
11740.50 = 19.5685P
`P = 11740.50/19.5685`
P = 600
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