Hello student,

To calculate the total interest on Rs. 3125 for 3 years with different rates of interest for each year, we calculate the simple interest for each year separately and sum them up.

Formula:

Simple Interest (SI) = (Principal × Rate × Time) / 100

First year:

SI = (3125 × 4 × 1) / 100 = Rs. 125

Second year:

SI = (3125 × 5 × 1) / 100 = Rs. 156.25

Third year:

SI = (3125 × 6 × 1) / 100 = Rs. 187.50

Total Interest:

125 + 156.25 + 187.50 = Rs. 468.75

Thus, the total interest is Rs. 468.75.

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Thank you and wishing you all the best for your bright future.