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प्रश्न
Mohan deposits ₹ 80 per month in a cumulative deposit account for six years. Find the amount payable to him on maturity, if the rate of interest is 6% per annum.
योग
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उत्तर
Monthly deposit = ₹80
n = total months = 6 × 12 = 72
r = rate of interest = 6% p.a.
Step 1: Calculate interest
Interest = `(Pxxn(n+1))/2xxr/(12xx100)`
`= 80xx(72xx73)/2xx6/1200`
`(72xx73)/2` = 36⋅73
= 2628
80 × 2628 `xx 6/1200`
`80xx6/1200`
`=480/1200`
= 0.4
= 0.4 × 2628
= 1051.2
A = Total deposit + Interest
80 × 72
= 5760
A = 5760 + 1051.2
= 6811.2
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