A certain sum invested for T years at 10% per annum Simple Interest amounts to Rs. 400. The amount gets halved when the interest comes down to 4% per annum, the principal and time being the same. What is the principal and value of T?
1
T = 50 years; P = Rs. 200
2
T = 25 years; P = Rs. 200/3
3
T = 50 years; P = Rs. 200/3
4
T = 50 years; P = Rs. 100