If the simple interest on a sum of money for 15 months at 71/2 % per…

Question

If the simple interest on a sum of money for 15 months at 71/2 % per annum exceeds the simple interest on the same sum for 8 months at 121/2 % per annum by Rs. 32.50, then the sum of money ( In Rs.) is ?

Accepted Answer

Option C. Rs. 3120. Answer & Solution Answer: Option C Solution: & T_1 = 15 months & \,\,\,\,\,\, = 1512years & R_1 = 71/2\% = 152\% & T_2 = 8 months & \,\,\,\,\,\,\, = 812years & R_2 = 121/2\% = 252\% & Let the principal = P & According to the question, & P × 15 × 1512 × 2 × 100 - P × 25 × 812 × 2…