Answer :
Compound interest, CI = Rs.510
Interest rate, R = 12% = 25/2% per annum
Time = 2 years
CI = P (1 + R/100)n – P
⇒ 510 = P (1 + (25/2)/100)2 – P
⇒ 510 = P (1 + 1/8)2 – P
⇒ 510 = P (9/8)2 – P
⇒ 510 = 81P/64 – P
⇒ 510 = (81P – 64P)/64
⇒ 510 = 17P/64
⇒ P = 510 × 64/17
⇒ P = 30 × 64
⇒ P = 1920
Now,
SI = PRT/100
= (1920 × 25/2 × 2)/100
= (1920 × 25)/100
= 480
∴ Simple interest = Rs.480
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