41.
If the simple interest on Rs. 3000 is less than the Simple Interest on Rs. 2000 at 5% by Rs. 50, find the time.
• A.
2
• C.
3
• B.
1
• D.
4
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Explanation :

 Here P1 = Rs. 3000 P2 = Rs. 2000

 Difference in interest = (Difference in P) x N x R 100

 50 = 1000 x 5 x N ; N = 1 year 100

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42.
If Rs. 750 amounts to Rs. 1000 in 5 years, What will it become in 10 years at S.I.
• A.
1250
• C.
2050
• B.
1520
• D.
2000
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Explanation :

P = 750; SI = 250; N = 5

Let the rate of interest be R

 R = 100 x I = 100 x 250 = 20 % PN 750 x 5 3

 Amount in 10 years = 750 + 750 x 20 x 10 3 100

 = 750 + 500 = Rs. 1250

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43.
 The Sum of money that will produce Rs. 1770, interest in 7 1 years at 8% simple interest 2
per annum is
• A.
Rs. 2950
• C.
Rs. 2800
• B.
Rs. 3120
• D.
None of these
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Explanation :

 Here, I – Rs. 1770, R = 8% per annum, T = 15 years 2

Principal (P) = 100 x I = 100 x 1770
R x T
 8 x 15 2

 = Rs. 2950

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44.
If the simple interest on a certain sum of money for 2 years is one – fifth of the sum, then the rate of interest per annum is
• A.
9%
• C.
8%
• B.
10%
• D.
None of these
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Explanation :

We have, T = 2 years.

Let the principal be Rs. x

 Then, simple interest (I) = Rs. x 5

Rate of interest (R) =
 =
100 x x
100 x I 5
P x T x x 2

 100 = 10% p.a. 5 x 2

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45.
A certain sum in invested for T years. It amounts to Rs. 400 at 10% per annum. But when invested at 4% per annum, it amounts to Rs. 200. Find the time (T).
• A.
41 years
• C.
50 years
• B.
39 years
• D.
None of these
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