Question
A certain sum of money earns Rs. 360 as Simple Interest
and Rs. 381.6 as Compound Interest over a period of 2 years. What is the rate of interest?Solution
Let, rate of interest and principle amount be ‘r%’ per annum and Rs. ‘P’, respectively. Compound interest = P × {(1 + r/100)2 – 1} = 381.6 Simple interest = (P × r × 2)/100 = 360 So, P × {(1 + r/100)2 – 1} - (P × r × 2)/100 = 381.6 – 360 Pr2/10000 = 21.6 Pr = 216000/r So, (P × r × 2)/100 = 360 216000/r × 2 = 36000 r = 12
6400, 1600, ?, 80, 16, 4
2, 2, 6, 30, ?, 1890
What will come in place of the question mark (?) in the following series?
34, 61, 7, ?, -20, 115
312, 302, 282, ?, 212, 162
150, 158, 131, 195, 70, ?Â
8Â Â Â 8Â Â Â 12Â Â Â 24Â Â Â Â 60Â Â Â Â Â ?
33, ?, 66, 82.5, 99, 115.5
97, 106, ?, 195, 411, 460
30          162        344        ?             890        1270
...What will come in place of the question mark (?) in the following series?
146, 122, ? , 74, 50, 26
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