**51. If there is a total of 104 weekly installments and a third deposit, find the interest charged**

**A. 237.55**

B. 337

C. 443

D. 334

**52. A sum of money becomes 7⁄5 of itself in 4 years at a certain rate of simple interest. The rate per annum is :**

A. 9%

**B. 10%**

C. 11%

D. 12%

**53. A sum of money amounts to Rs. 9800 after 5 years and Rs. 12005 after 8 years at the same rate of simple interest. The rate of interest per annum is:**

A. 5%

B. 8%

**C. 12%**

D. 15%

**54. A sum was put at simple interest at a certain rate for 3 years. Had it been put at 2% higher rate, it would have fetched Rs 360 more. Find the sum.**

A. Rs.4000

B. Rs.9000

C. Rs.5000

**D. Rs.6000**

**55. A sum of Rs. 2500 amounts to Rs. 3875 in 4 years at the rate of simple interest. What is the rate of interest?**

A. 12.25%

B. 12%

C. 6%

**D. 13.75%**

**56. A man invests a certain sum of money at 6% per annum simple interest and another sum at 7% per annum simple interest. His income from interest after 2 years was Rs. 354. One-forth of the first sum is equal to one-fifth of the second sum. The total sum invested was :**

A. Rs.3100

**B. Rs.2700**

C. Rs.2200

D. Rs.1800

**57. What is the rate of interest at which Rs.150 becomes Rs. 220 in 10 years.**

A. 11/3%

**B. 14/3%**

C. 12%

D. 14%

**58. How long will it take for a sum of money to grow from Rs.1250 to Rs.10,000, if it is invested at 12.5% p.a simple interest?**

A. 65 years

**B. 56 years**

C. 45 years

D. 57 years

**59. A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is :________?**

A. Rs. 700

B. Rs. 690

C. Rs. 650

**D. Rs. 698**

**60. You deposit $600 into a 6 month certificate of deposit. After 6 months the balance is $618. Find the simple annual interest rate**

**A. 6%**

B. 5%

C. 7%

D. 8%