Simple Interest – Find the principal from total interest: The simple interest on a certain sum for 3 years at 14% per annum is Rs 235.20. Find the principal.

Introduction / Context:
Given SI, rate, and time, the principal is obtained using SI = P * r * t. This is a direct inversion problem under simple interest.

Given Data / Assumptions:

• SI = Rs 235.20
• r = 14% = 0.14 per annum
• t = 3 years

Concept / Approach:
P = SI / (r * t).

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

• Rs 480 / 650 / 720 / 520: do not reproduce SI = Rs 235.20 under the given rate and time.

Common Pitfalls:

• Miscalculating decimal multiplication 0.14 * 3.

Final Answer:
Rs 560.