Step-by-step Solution:

We are given that Hari got 60% more amount after 8 years under simple interest. This means: \[ \text{Total Amount} = \text{Principal} + \text{Simple Interest} \] \[ \text{Simple Interest} = 60\% \text{ of Principal} = \frac{60}{100} P = 0.6 P \] Using the formula for Simple Interest: \[ SI = \frac{P \times R \times T}{100} \] where:
\( P \) = Principal
\( R \) = Rate of Interest per annum
\( T \) = Time in years
For 8 years: \[ 0.6 P = \frac{P \times R \times 8}{100} \] Cancel \( P \) (since \( P \neq 0 \)): \[ 0.6 = \frac{8R}{100} \] \[ R = \frac{0.6 \times 100}{8} = \frac{60}{8} = 7.5\% \] Step 2: Find Interest for Rs. 9600 Over 4 Years
Using the Simple Interest formula again for Rs. 9600 over 4 years: \[ SI = \frac{9600 \times 7.5 \times 4}{100} \] \[ SI = \frac{9600 \times 30}{100} \] \[ SI = \frac{288000}{100} = 2880 \] Final Answer
The total interest Hari would get after 4 years is: \( Rs. 2880 \)