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प्रश्न
Rekha opened a recurring deposit account for 20 months. The rate of interest is 9% per annum and Rekha receives Rs. 441 as interest at the time of maturity.
Find the amount Rekha deposited each month.
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उत्तर
Let the monthly installment i.e P = Rs. x.
Since n = 20 months and r = 9%
∴ Interest `= P xx (n(n+1))/(2xx12) xx r/100`
`= (x xx 20 (21))/(2xx12) xx 9/100`
` = (x xx20xx21 )/(2xx12) xx 9/100`
` = (x xx 5xx7xx9)/(2xx100)`
Interest = 1.575 × P
Interest = 441 {Given}
⇒ 1.575 x = 441
x = 280 Rs.
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Given below is a page from the passbook of a saving bank account of Dolly Majumdar. Complete the entries in the passbook and find the interest earned by the account holder in the month of November if the rate of simple interest is 5°/o pa.
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| 01.04.2007 | By B/F | 16500.00 | ||
| 15.04.2007 | By Cash | 2500.00 | ||
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| 05.09.2007 | To Cash | 4000.00 | ||
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