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Question

Rupees 4000 amount to Rs. 5000 in 8 years: in what time will Rs. 2100 amount to Rs. 2800 at the same rate?


Solution

In first case:
A= Rs. 5000
P=Rs.4000
I=A-P
=Rs. 5000 -Rs. 4000
=Rs. 1000
T=8 years
R=100×IP×R
=100×10004000×8
=258 %
In the second case:
A=Rs. 2800
P=Rs. 2100
I= Rs. 2800-Rs. 2100=Rs. 700
R=258 % \( T= \frac{100 \times I}{P \times R}= \frac{100 \times 700}{2100 \times \frac{25}{8} \) =100×700×82100×25=323years=1023years =1023×12months=10243months
=10 years 8 months

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