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ICSE Class 9 Answered

A man invested Rs.5000, apart of it at 12%p.a. and the rest at 14p.a. If he had received a total annual interest of of Rs.636, how much did he invest at 14%p.a.?
Asked by Ponrajan Himashree | 09 Aug, 2013, 07:27: PM
answered-by-expert Expert Answer
interest = P*R*t/100 where P is the principal, R is the rate of interest and t is the time
 
Hence, let the amount invested at 12% rate = Rs x
Then, the amount invested at 14% interest = Rs (5000-x)
 
Total annual interest = x*12*1/100 + (5000-x)*14*1/100
636 = (12x + 70000-14x)/100
63600 = 70000-2x
2x = 6400
x = Rs 3200
 
Hence, amount invested at 14% = 5000-3200 = Rs 1800
Answered by | 11 Aug, 2013, 02:43: AM

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