Compound interest on certain sum at 15% per annum for 3 year is Rs. 6250.5. Find the principal. किसी धनराशि पर 15% प्रति वर्ष की दर से 3 वर्षों का चक्रवृद्धि ब्याज 6252.56 है मूलधन ज्ञात कीजिये।

Compound Interest formula: CI = P(1 + r/100)³ - P = 6250.5. At 15% for 3 years: CI = P(1.15)³ - P = P(1.520875) = 0.520875P. If P = 12000: CI = 12000 × 0.520875 = 6250.5 ✓. Option A (18000) would give CI = 9375.75. Option B (15000) would give CI = 7813.13. Option C (20000) would give CI = 10417.5. Note: Question states CI as 6250.5 in one place and 6252.56 in another - assuming 6250.5 is correct based on calculation.