The compound interest of Rs. 20480 at 61/4% per annum for

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The compound interest of Rs. 20480 at 6¹/₄% per annum for 2 years 73
days is ?

1. Rs. 3000
2. Rs. 3131
3. Rs. 2929
4. Rs. 3636

Correct Option: C

C.I. = Rs[20480 x(1 +25/4 x 100)² (1 + 1/5 x 25/4 x 100) - 20480 ]
= Rs.[(20480 x 17/16 x 17/16 x 81/80) - 20480]
= 20480[23409 - 20480/20480]
= Rs .2929