Explanation:

- Ram invested 45% of his salary at 10% compound interest over three years.

- The total interest received from this investment is Rs5,958.

- The formula for compound interest is A = P(1 + r/n)^(nt), where A is the amount, P is the principal, r is the rate, n is the number of times interest is compounded per year, and t is the time in years.

- Here, interest is compounded annually (n = 1), so the formula simplifies, and we focus on interest gained.

- To find Ram's salary, we first need to calculate his initial investment (P) that resulted in Rs5,958 in interest.

- Let's denote Ram's salary as S. Thus, the investment P = 0.45 * S.

- Using the compound interest formula, 5,958 = P * [(1 + 0.10)^3 - 1].

- Calculate: [(1 + 0.10)^3 - 1] = [1.1^3 - 1] = [1.331 - 1] = 0.331.

- Now, 5,958 = 0.331 * (0.45 * S).

- Solving for S, 5,958 = 0.14895 * S, S = 5,958 / 0.14895 ˜ Rs40,000.

Option:4 - Rs40,000