In what time will the simple interest on Tk. 400 at 10% per annum be the same as the simple interest on TK. 1000 4 years at 4% per annum?
A
3 years
B
4 years
C
5 years
D
6 years
Correct Answer: 4 years
W know, simple interest, I = Prn ATQ, 400×10100×n = 1000×4100×4⇒40n = 160⇒n = 16040.'. n = 4years