Simple Interest
11.
A sum was interest for 4 yr at a certain rate of simple interest. It the had been invested at 2% more annual rate of interest, then Rs 56 more would have been obtained. What is the sum?
A.
Rs 680 B.
Rs 700 C.
Rs 720 D.
Rs 820

Answer: Option B

Explanation: I2 – I1 = Rs 56, R 2- R1 = 2%, T = 4yr
According to the formula,
I2 – I1 = PT (R2 –R1) /100
56 = P x 4 x 2 /100
P = 56 x 100 / 8 = Rs 700

12.
The simple interest on a certain sum of money for 2 ½ yr at 12% per annum is Rs 20 less than the simple interest on the same sum for 3 ½ yr at 10% our annum. Find the sum ?
A.
Rs 800 B.
Rs 750 C.
Rs 625 D.
Rs 400

Answer: Option D

Explanation: Let the sum be P
Then, P x 10 x 7 / 100 x 2 - P x 12 x 5 / 100 x 2 = 20
7P / 20 - 3P /10 = 20
P = 20 x 20 = Rs 400

13.
Find the differences in amount and principal for Rs 4000 at the rate of 5% annual interest in 4yr.?
A.
Rs 865.50 B.
Rs 865 C.
Rs 400 D.
Rs 800

Answer: Option D

Explanation: Here, p = Rs 4000, R = 5%,T = 4yr
SI = P x R x T /100 = 4000 X 5 x 4 / 100
= Rs 800

14.
Rashmi lent Rs 600 to Geeta for 2 yr and Rs 150 to seta for 4 yr and received altogether Rs 80 as simple interest from both, find the rate of interest
A.
3% B.
4% C.
5% D.
None of these

Answer: Option D

Explanation: No..

15.
The simple interest on a sum of money is 1 / 16 of the principal and the number of year is equable to the rate percent annum. Find the rate percent. ?
A.
5% B.
7% C.
9% D.
None of these

Answer: Option D

Explanation: No..

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