What is the rate of interest, if there is a difference of Rs. 121.50121.50 between the simple interest and the compound interest on principle of Rs. 15,00015,000 for 22 years.compound epithelium.

# What is the rate of interest, if there is a difference of Rs. 121.50121.50 between the simple interest and the compound interest on principle of Rs. 15,00015,000 for 22 years.compound epithelium.

1. A
4%
2. B
6%
3. C
9%
4. D
8%

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### Solution:

The principal amount in Rs.,
Time in years is, The simple interest is given by,
The compound interest is given by,
P= Principal amount,
r= Rate of interest
t= Time in years.
The difference D of simple interest and compound interest is given Rs.121.5
Substituting the value of Difference, D=121.5, Principal P=15,000 and Time,t=2 in

The LCM of 1000010000,11 and 100100 is 10000

Using the identity , here a=100 and b=r

The value of is calculated
Taking the square root

Hence, the value of rate of interest is, So, option 3 is correct.

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