1) A sum of money at simple interest amounts to Rs. 900 in 3 years and to Rs. 954 in 4 years. The sum is: A) Rs. 800 B) Rs. 790 C) Rs. 792 D) Rs. 750 E) Rs. 780 Answer: Option CExplanation:$SI$ for $1$ year = Rs. $(954-900)$ = Rs. $54$. $SI$ for $3$ years = Rs. $(54\times 3)$ = Rs. $162$. So the Principal = Rs. $(954-162)$ = Rs. 792.
