How long will it take for an amount of Tk. 450 to yield Tk. 81 as interest at 4.5% per annum of simple interest -
A
4 years
B
4.5 years
C
5 years
D
5.5 years
Correct Answer: 4 years
Prime numbers that are greater than 60 but less than 70 are 61 and 67. So, their sum is = 61 + 67 = 128