A Bank lends Rs, 30,00,000/- to a person P at 12.5% simple interest and Rs. 10,00,000/- to another person Q at 10.5% simple interest, for t years. If the Bank received an interest of Rs. 16,80,000/- at the end of the period t, then t =

A

2 $$\frac{1}{2}$$

B

3

C

3 $$\frac{1}{2}$$

D

4