Explanation:

- First, let's calculate the principal using simple interest:

- Simple Interest (SI) = Principal (P) × Rate (R) × Time (T) / 100

- Given: SI = Rs 315, R = 3% p.a, T = 3 years

- 315 = P × 3 × 3 / 100

- Principal (P) = Rs 3500

- Next, calculate the compound interest (CI) using the formula:

- CI = P × (1 + R/100)² - P

- Given: P = Rs 3500, R = 4% p.a., Time = 2 years

- CI = 3500 × (1 + 4/100)² - 3500

- CI = 3500 × (1.04)² - 3500

- CI = 3500 × 1.0816 - 3500

- CI = Rs 285.6

- Now, we compare with given options:

- Option 1: Rs 228.48

- Option 2: Rs 204

- Option 3: Rs 326.6

- Option 4: Rs 285.6

- The correct answer is Option 4: Rs 285.6.

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