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Question

Mr. Rahul invested ₹2,000 each year at the start of the year, compounded half-yearly at a rate of 10%. After a year and a half, he withdraws ₹1,000. Determine his savings at the start of the third year.

A
₹6,636
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B
₹5,586
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C
₹6,431
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D
₹2,800
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Solution

The correct option is B ₹5,586
Rate of interest r = 10%, compounded half-yearly
At the start of the first year,
Principal, P = ₹2,000
Amount after 6 months = 2,000+2,000×102×100
=2,000+100=2,100
Principal after 6 months = ₹2,100
Amount after a year = 2,100+2,100×102×100
=2,100+105=2,205
Amount after a year = ₹2,205
Amount at the start of second year = 2,205 + 2,000 = ₹4,205
(₹2,000 invested at the beginning of every year)
Amount after one and a half year = 4,205+4,205×102×100
=4,205+210.25=4,415.25
He withdraws ₹1,000 after a year and half.
Principal after one and a half years = 4,415.25 - 1,000 = ₹3,415.25
Amount after two years = 3,415.25+3,415.25×102×100
= 3,415.25 + 170.7625= ₹ <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 3,586.0125
Amount at the beginning of third year = 3,586.0125 + 2,000 = ₹ <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 5,586.0125 = ₹5,586

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