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.## Management Sciences

A. Rs 900

**B. Rs 1000**

C. Rs 1050

D. Rs 1100

Explanation:

Let the principal be Rs x.

Then X × (1 + 10/100)3 – x = 331

=> (x × 11/10 × 11/10 × 11/10 – x) = 331

=> ((1331x-1000x)/1000) = 331

=> 331x = 331000

=> X = 1000

Hence the principal is Rs 1000

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