Question
Ujwal took a loan at 18% per annum simple interest for 2
years and repaid a total of Rs. 40,800. If he had instead taken the same loan at r % per annum compound interest, compounded annually for 2 years, he would have paid Rs. 2,400 more in interest. Find the value of r.Solution
Let principal = Rs. P
Given, P + (P * 18 * 2)/100 = 40800
=> P = 30000
S.I = 40800 - 30000 = Rs. 10800
C.I = 10800 + 2400 = Rs. 13200
Total amount at C.I = 30000 + 13200 = Rs. 43200
30000(1+r/100) 2 Â = 43200
=>(1+r/100) 2 Â = 144/100
=> 1 + r/100 = 12/10
=>r = 20
41 28 ? 15 67 2
3 15 35 63 99 ?
4                14                  130                     512                �...
1 1 8 4 27 9 81
...Select the number from among the given options that can replace the question mark (?) in the following series.
24, 35, 51, 73, 102, ?
4 5 12 39 160 ?
...10, 22, 46, ?, 130, 190
3  16  22  ?   98   206
542Â Â Â Â Â Â 541Â Â Â Â Â Â Â 532Â Â Â Â Â Â Â 507 Â Â Â Â Â Â Â 458Â Â Â Â Â Â Â ?
...If   314     306      x      269       394    178    1480
Then, 1/3 x + 2x - x = ?
...
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