Simple Interest

9. If x is the interest on y and y is the interest on z, the rate and time is the same on both the cases. What is the relation between x, y and z? A)x2=yz B)xyz=1 C)y2=xz D)z2=zx Answer : Option C Explanation: X = (Y*NR)/100 Y = (Z*NR)/100 X/Y = NR/100 Y/Z = NR/100 X/Y = Y/Z Y2 = XZ 10. If Re.1 amounts to Rs.9 over a period of 20 years. What is the rate of simple interest? A)15% B)20% C)30% D)40% Answer : Option D Explanation: 8 = (1*20*R)/100 R = 40% 11. In how many years will a sum of money doubles itself at 5% per annum on simple interest? A)25 yr B)22 yr C)20 yr D)21 yr Answer : Option C Explanation: P = (P*5*R)/100 R = 20% 12.. If Rs.450 amount to Rs.540 in 4 years, what will it amount to in 6 years at the same rate % per annum? A)485 B)385 C)585 D)685 Answer : Option C Explanation: 90 = (450*4*R)/100 R = 5% I = (450*6*5)/100 = 135 450 + 135 = 585

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