A sum was invested on simple interest at a certain rate for 2 years. Had it been put at 3% higher rate, it would have fetched Rs.72 more. The sum is
Options:
A . Rs.1,500
B . Rs.1,200
C . Rs.1,800
D . Rs.1,600
Answer: Option B Answer: (b)Let the sum = P and original rate = R% per annum.Then, ${P × (R + 3) × 2}/100 - {P × R × 2}/100 = 72$${P × 3 × 2}/100 = 72$P = ${72 × 100}/{3 × 2}$ = Rs.1200 Using Rule 13The difference between the S.I. for a certain sum $P_1$ deposited for time $T_1$ at $R_1$ rate of interest and another sum $P_2$ deposited for time $T_2$ at $R_2$ rate of interest isS.I. = ${P_2R_2T_2 - P_1R_1T_1}/100$
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