A sum when invested at a certain rate of simple interest becomes 3 times itself in 25 years. Find the rate of interest.
Let the sum invested be Rs. ‘P’ and rate of interest be ‘r’% p.a. So, the amount received at the end of 25 years = Rs. ‘3P’ So, interest earned = 3P-P = Rs. ‘2P’ ATQ. 2P = (P × r × 25) ÷ 100 Or r = 8% So, rate of interest = 8% pa
71 81 61 101 51 181
420, 380, 340, 300, 280, 220, 180
21 32 54 86 131 186
...7, 16, 33, 74, 153, 312
20.5, 30, 40.5, 53, 64.5, 78
225, 45, 450, 90, 900, 150, 1800
3 4 18 72 360 2160
12, 28, 64, 128, 228, 379
12, 36, 41, 121, 128, 384
131, 212, 261, 286, 295, 299
