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प्रश्न
Dolly has a cumulative time deposit account in a bank. She deposits ₹ 600 per month for 6 years. If at the end of maturity period she gets ₹ 55026, find the rate of interest.
बेरीज
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उत्तर
Given:
Monthly deposit, P = ₹ 600
Time, n = 6 years = 72 months
Maturity value (MV) = ₹ 55026
Total amount deposited
600 × 72
= ₹ 43200
Interest earned
Interest = 55026 − 43200
= ₹ 11826
Use interest formula
Interest (I) = `(Pxxn(n+1)xxr)/(2xx12xx100)`
`11826 = (600xx72xx73xxr)/(2xx12xx100)`
`= (600xx6256xxr)/2400`
`= (3153600xxr)/2400`
`11826 = (3153600 r)/2400`
`=> r = (11826xx2400)/3153600`
= 9%
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