Simple Interest

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31 A sum of money at a certain rate per annum of simple interest doubles in the 5 yr and at a different rate becomes three times in 12 years. The lower rate of interest per annum is  

A
16($$\frac{2}{3}$$)%
B
17($$\frac{2}{3}$$)%
C
15($$\frac{2}{3}$$)%
D
18($$\frac{2}{3}$$)%

32 Nalini borrowed ₹ 1075 from her friend at 7% per annum. She returned the amount after 7 years. How much amount did she pay? 

A
1636.75
B
1630.75
C
1601.75
D
1642.75

33 What would be the amount to be paid on the principal of 6500 ₹ at the end of 2 years at compound interest at the rate of 15 % per annum?

A
8576.25
B
8530.25
C
8596.25
D
8588.25

34 Virat has ₹ 9000. He gives this money to Mahendra on simple interest and after 4 years received the double amount. If the interest rate is 5% more than the previous, in how many years this amount will be doubled?

A
3(1/3)years
B
4(1/3)years
C
5(1/3)years
D
2(1/3)years

35 What would be the amount to be paid on the principal of 14000 ₹ at the end of 3 years at compound interest at the rate of 5 % per annum  ?

A
16206.8
B
16306.8
C
16406.8
D
16506.8

36 On a certain Principal if the Simple interest for two years is ₹ 2400 and Compound interest for the two years is ₹ 2544, what is the rate of Interest?

A
11 %
B
12 %
C
13 %
D
14 %

37 A sum of ₹ 475 is lent at the rate of 2% per annum. Find the interest at the end of 3 years. 

A
26.5
B
20.5
C
28.5
D
22.5

38 A lent ₹ 5000 to B for 2 years and ₹ 3000 to C for 4 years on simple interest at the same rate of interest and received ₹ 2200 in all from both as interest. The rate of interest per annum is 

A
16%
B
10%
C
18%
D
12%

39 What principal will amount to ₹ 1600 in 6 years at 10% simple interest:

A
1600
B
1000
C
1800
D
1200

40 Find the simple interest on ₹ 2000 at 7 % per annum for 2 years

A
₹ 260
B
₹ 200
C
₹ 280
D
₹ 220