1)Find the difference between the simple interest and the compound interest at 5% per annum for 2 years on principal of Rs. 2000.
A)5
B)10.5
C)4.5
D)5.5
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Answer A)5
The difference between compound interest and simple interest over two years is given by
Pr2/1002 or P(r/100)2
Here, Principal (P) = Rs. 2000
Rate (r) = 5%
Now difference, D = (2000*5*5)/(100*100)
D = Rs5
2) Rs 1200 is lent out at 5% per annum simple interest for 3 years. Find the amount after 3 years.
A)Rs1380
B)Rs1290
C)Rs1470
D)Rs1200
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Answer A)1380
3)Interest obtained on a sum of Rs. 5000 for 3 years is Rs. 1500. Find the rate percent.
A)8%
B)9%
C)10%
D)11%
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Answer C)10%
4) Rs. 2100 is lent at compound interest of 5% per annum for 2 years. Find the amount after two years.
A)Rs2300
B)Rs2315.25
C)Rs2310
D)Rs2320
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Answer B)2315.25
We can use formula of compound interest;
A = P*[1+ (r/100)]n
A = 2100*[1+(5/100)]2
A = 2100*[105/100]2
A = (2100*11025)/10000
Hence, Amount, A=Rs2315.25.
5)What is the simple interest on a sum of Rs. 700 if the rate of interest for the first 3 years is 8% per annum and for the last 2 years is 7.5% per annum?
A)Rs269.5
B)Rs283
C)Rs273
D)Rs280
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Answer C)273
1st case:
I₁ = 700*3*8/100 = Rs. 168
2nd case:
I₂ = 700*2*7.5/100 = Rs. 105
Then total interest for five years = (I₁+I₂)= Rs273
6)5 4 10 27 ? 555
A)126
B)132
C)146
D)112
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Answer D)112
5 * 1 – 1 = 4
4 * 2 + 2 = 10
10 * 3 – 3 = 27
27 * 4 + 4 = 112…
7)1716, 990, 504, 210, 60, ?
A)8
B)2
C)6
D)4
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Answer C)6
Explanation :
12^3 – 12
10^3 – 10,
8^3 – 8,
6^3 – 6,
4^3 – 4,
2^3 – 2…
8)250 254 517 1567 ?
A)3096
B)9673
C)6967
D)6293
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Answer D)6293
250 * 1 + 2²= 254
254 * 2 + 3²= 517
517 * 3 + 4²= 1567
1567 * 4 + 5² = 6293
9)15 151 1210 ? 29056
A)5463
B)4263
C)6263
D)7263
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Answer D)7263
15 * 10 + 1 = 151
151 * 8 + 2 = 1210
1210 * 6 + 3 = 7263
7263 * 4 + 4 = 29056
10)52 54 28 30 ? 18 10
A)14
B)16
C)18
D)15
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Answer B)16
52 / 1 + 2 = 54
54 / 2 + 1 = 28
28 / 1 + 2 = 30…so on ..
