Problem: Mr. Karim deposited a certain amount of money for a fixed period of time. One maturity, he received a total of Tk. 45,000 and the ratio of interest and investment was 3 : 6. 1f the interest rate was 5%, calculate the time period for which the money as invested.
View all: NATIONAL BANK | OFFICER | RECRUITMENT QUESTION(MATH) SOLVE | 1997
Correct Answer: 10 year
Explanation:
Interest : Investment = 3 : 6
Sum ofthe this ratio = 3 + 6 = 9
Interest = 45,000 of $\frac{3}{9}$
= Tk. 15,000
Investment = 45,000 of $\frac{6}{9}$
= Tk. 30,000
At 5% rate of interest,
The interest of Tk. 100 is Tk. 5 for= 1 year
The interest of Tk. 1 is Tk. 5 for = 100 x 1 year
The interest of Tk. 1 is Tk. 1 for=$\frac{100}{5}$year
The interest of Tk. 30000 is Tk. 1 for = $\frac{100}{5\cdot30000}$ year
The interest of Tk. 30000 is Tk. 15000 for = $\frac{100\cdot 15000}{5\cdot30000}$ year
= 10 year
