1.

Nirmal invested an amount at the rate of 10% p.a on compound interest and after two years he again invested half of the initial amount. If hegot ₹1371.6 as interest after three years. find the amont received by him after three years. if he invested same amount on simple interest at rate of 15% p.a.?

Answer»

₹5,220
₹5,720
₹5,760
₹5,260

Solution :Let maninvested 153 ₹
And, AFTERTWO years amount invested
` = (A + A/2) = ₹ ( 3A)/2`
EQUIVALENT CI of two year at 10% p.a.
` = 10 + 10 + ( 10xx 10)/2 = 21 % `
ATQ
` A xx 21/100 + ( A + ( 21A)/100 + A/2) xx 10/100 = 1371.6`
0.210 A + 0.171 A = 1371.6
0.381 A = 1371 . 6
A = ₹ 3600
Required amount= ` 3600 + 3600 xx ( 15 xx 3)/100 = ₹ 5220`


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