Answer:

Solution:-

Given that,

• Principal, P = Rs 8000.
• Rate of interest, r = 9 % per annum.
• Simple interest, SI = Rs 2880.

Let assume that time period be n years.

We know,

Simple interest, (SI), Principal (P), Rate r and time (n) are connected by the relationship

n = SI × 100/P × r.

So, on substituting the values, we get

n = 2880 × 100/8000 × 9.

n = 288/8 × 9.

n = 32/8.

⟹ n = 4.

Hence, After 4 years, a sum of Rs 8000 invested at the rate of 9 % per annum yields a Simple interest of Rs 2880.

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