Formulas:
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Problems
1.
Due to the reduction in the rate of interest from 8% to 6% Rahim's income is reduced
by Tk. 77.50 in 5 years. What was his capital?
2.
How much money will become Tk. 575 as an amount in 5 years at the rate of
interest by which Tk. 450 becomes Tk. 504 as an amount in 4 years?
3.
Due to an increase in the rate of interest from 8% to 10%, Jisan’s income is
increased by Tk. 128 in 4 years. What was his capital?
4.
Azmain borrowed Tk. 400 for 3 years and Tk. 600 for 5 years and gave a total of
Tk. 168 as an interest. If the rate of interest in both the cases is the same,
then how much was the rate of interest?
5.
In how many years will a certain sum of interest on Tk. 700 at 10% per annum be
found if that certain sum of interest is found from Tk. 1050 in 5 years at 8%
per annum?
6.
Interest on Tk. 250 in 6 years at 3% interest per annum is equal to the
interest on a sum of money for 4 years at 5% per annum. What is that sum of
money?
7.
Amount is Tk. 442 on any sum of principal in 6 years at 5% per annum. In how
many years will its amount be Tk. 510?
8.
How much money is to be deposited in the bank at the rate of interest of 6% per
annum so that in each day a sum of Tk. 60 as interest is found?
9.
A sum of principal becomes Tk. 550 as amount after 5 years and interest is 
of the principal. How much is the
principal and rate of interest per annum?
10.
The amount for a certain period of time is Tk. 450 and interest is 
of the principal. If the rate of interest is 
per
annum, find the time.
11.
The interest on Tk. 500 in 4 years at 6% is equal to the interest on a sum principal
in 
years
at 5%. How much is that sum of money?
12.
If some principal becomes double as an interest-principal in 20 years, then in
how many years will it become thrice of that principal?
13.
Any sum of principal after 3 years is Tk. 1452 as amount and after 5 years is Tk.
1620 as amount. Find the principal and the rate of interest.
14.
In how many years will interest of sum principal will be 
of the principle at the
rate of 
% interest per annum?
15.
A capital becomes its double as profit-principal after 6 years at a particular rate
per annum. How much will the sum of money become Tk. 2050 as an amount at the
previous rate in 4 years?
16.
A sum of principal becomes Tk. 560 as amount after 3 years and Tk. 600 as an
amount after 5 years respectively. What is the rate of interest?
17.
A sum of Tk. 750 at the interest of 8% and another sum of Tk. 1250 at 6% were invested.
What is the average percentage rate of interest of the total sum of capital?
