16.
 The compound interest of Rs. 20480 at 6 1 % per annum for 2 years 73 days is - 4
• A.
Rs. 3000
• C.
Rs. 2929
• B.
Rs. 3131
• D.
Rs. 3636
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Explanation :

C.I. = Rs. 20480 x
 1 + 25 4 x 100
2
 1 + 1 x 25 5 4 x 100
- 20480

= Rs.
 20480 x 17 x 17 x 81 16 16 80
- 20480

= 20480
 23409 - 20480 20480

 = Rs. 2929

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17.
If the compound interest on a certain sum for 2 years in Rs. 60.60 and the simple interest Rs. 60; then the rate of interest per annum is
• A.
2%
• C.
4%
• B.
3%
• D.
None of these
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Explanation :

 We have,

C.I. - S.I. = R x S.I. 60.60 - 60 =  R x 60
200 200

R = 0.60 x 200  = 2%
60

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18.
The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525. The simple interest on the same sum for double the time at half the rate percent per annum is:
• A.
Rs. 400
• C.
Rs. 600
• B.
Rs. 500
• D.
Rs. 800
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Explanation :

Let the sum be Rs. P. Then,

p
 1 + 10 2 100
- P    = 525

P
 11 2 10
- 1    = 525

P =
 525 x 100 21
= 2500.

Sum = Rs. 2500.

 So, S.I. = Rs. 2500 x 5 x 4 = Rs. 500 100

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19.
The compound interest on a sum for 2 years is Rs. 832 and the simple interest on the same sum for the same period is Rs. 800. The difference between the compound and simple interest for 3 years will be -
• A.
Rs. 48
• C.
Rs. 98.56
• B.
Rs. 66.56
• D.
None of these
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Explanation :

S.I. for first year = Rs. 400

S.I. on Rs. 400 for 1 year = Rs. 32

Rate = 100 x 32  = 8%
400 x 1

Hence, the difference for 3rd year is S.I. on Rs. 832

 = Rs. 832 x 8 100

 = Rs. 66.56

Total difference = Rs. (32 + 66.56)

 = Rs. 98.56

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20.
On a certain sum of money, the simple interest for 2 years is Rs. 200 at the rate of 7% per annum. Find the difference in C.I. and S.I.
• A.
Rs. 7
• C.
Rs. 11
• B.
Rs. 9
• D.
None of these
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