37
Q:

A sum of Rs. 725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of Rs. 362.50 more is lent but at the rate twice the former. At the end of the year, Rs. 33.50 is earned as interest from both the loans. What was the original rate of interest?

 A) 3.46% B) 4.5% C) 5% D) 6%

Explanation:

Let the original rate be R%. Then, new rate = (2R)%.

Note: Here, original rate is for 1 year(s); the new rate is for only 4 months i.e.1/3 year(s).

$725*R*1100+362.50*2R*1100*3=33.50$

=> (2175 + 725) R = 33.50 x 100 x 3

=>  (2175 + 725) R = 10050

=>  (2900)R = 10050

=> $R=100502900=3.46$

Original rate = 3.46%

Q:

The simple interest on a certain sum at the end of three years at 5%p.a. is ₹1,200. The compound interest on the same sum for the same period at the same rate is (interest compounded yearly):

 A) ₹1,800 B) ₹1,261 C) ₹820 D) ₹1,260

Explanation:

1 976
Q:

A sum of money invested for 4 years and 9 months at a rate of 8% simple interest per annum became Rs. 1,035 at the end 0 of the period. What was the sum that was initially invested?

 A) Rs. 700 B) Rs. 675 C) Rs. 725 D) Rs. 750

Explanation:

4 317
Q:

At what percent of simple interest will a sum 0f money double itself in 15 years?

 A) 6 1/3% B) 6 2/3% C) 6 1/2% D) 6%

Explanation:

3 365
Q:

What is the total earning after 2 years from Rs.18,750 on variable compound interest if the rate of interest for the first 4 year is 4% and for the second, it is 8%?

 A) ₹ 1,740 B) ₹ 1,760 C) ₹ 1,670 D) ₹ 2,310

Explanation:

1 1892
Q:

The simple interest on a sum of Rs.50,000 at the end of two years is Rs.4,000. What would be the compound interest on the same sum at the same rate for the same period ?

 A) 4,040 B) 4,080 C) 4,008 D) 8,000

Explanation:

1 1897
Q:

Rs. 775 invested for 6 years gives an interest of Rs. 372. The rate of simple interest per annum is:

 A) 8% B) 7% C) 9% D) 7.5 %

Explanation:

2 384
Q:

In how many wars will an amount be doubled at 28.75% annual rate of interest?

 A) 3.00 B) 3.90 C) 3.47 D) 6.00

Explanation:

0 1230
Q:

If in 13 years a fixed sum doubles at simple interest, what will be the interest rate per year? (Correct to two decimal places)

 A) 8.69% B) 7.69% C) 7.29% D) 7.92%