10
Q:

# A person lends Rs. 300 to A at 4% and Rs.540 to B at 6% for the same time. if the total amount that he gets at the end is Rs. 1032. What is the time?

Q:

In what time will Rs. 1860 amount to Rs. 2641.20 at simple interest 12% per annum?

 A) 2.9 years B) 3.5 years C) 4.2 years D) 4.7 years

Explanation:

Given that Rs. 1860 will become Rs. 2641.20 at 12%

=> Interest = 2641.20 - 1860 = Rs. 781.20

We know I = PTR/100

=> 781.20 x 100 = 1860 x T x 12

=> T = 78120/1860x12

=> T = 78120/22320

=> T = 3.5 years.

3 75
Q:

A sum of money triples itself in 8 years simple interest. Find the rate of percent per annum?

 A) 30% B) 25% C) 22% D) 18%

Explanation:

The rate of percent R is given by,

4 153
Q:

A certain amount earns simple interest of Rs. 2260 after 3 years. Had the interest been 1 % more how much more interest would it have earned ?

 A) Rs. 175 B) Rs. 220.75 C) Rs. 126 D) Can't be determined

Explanation:

Here given Interest earned = Rs. 2260

Time = 3 years

Rate of interest = ?

Principal Amount = ?

So, it can't be determined.

11 203
Q:

A person lends Rs. 1540 for five years and Rs. 1800 for four years. If he gets Rs. 1788 as interest on both amounts, what is the rate of interest ?

 A) 14.5% B) 11% C) 12% D) 10.5%

Explanation:

Let the interest rate be r%

We know that,

S.I = PTR/100

=> (1540 x 5 x r)/100  +  (1800 x 4 x r)/100 = 1788

=> r = 178800/14900 = 12%

12 403
Q:

The total simple interest earned on a sum of money increases by Rs. 600 when the rate of interest increases by 2% per annum. If the investment was made for 5 years, find the sum of money that was invested ?

 A) Rs. 6000 B) Rs. 5550 C) Rs. 7500 D) Rs. 6580

Explanation:

Let the sum invested be Rs. P

Let the rate of interest be R% per annum

=> Interest earned for 5 years = (P x 5 x R/100) = PR/20

Now, given that the interest earned increased by Rs. 600 if the Rate increased to (R+2)%

=> SI = (P x 5 x (R+2))/100 = PR/20 + 10P/100

Hence,

PR/20 + 10P/100 = PR/20 + 600

=> P = 6000

Therefore, the sum invested is Rs. 6000