Simple interest
2.  Mr. Thomas invested an amount of Rs. 13,900 divided in two different schemes A and B at the simple interest rate of 14% p.a. and 11% p.a. respectively. If the total amount of simple interest earned in 2 years be Rs. 3508, what was the amount invested in Scheme B?  
Answer: Option A Explanation:
Let the sum invested in Scheme A be Rs. x and that in Scheme B be Rs. (13900 – x).
28x – 22x = 350800 – (13900 x 22) 6x = 45000 x = 7500. So, sum invested in Scheme B = Rs. (13900 – 7500) = Rs. 6400. 
3.  A sum fetched a total simple interest of Rs. 4016.25 at the rate of 9 p.c.p.a. in 5 years. What is the sum?  
Answer: Option D Explanation:

4.  How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?  
Answer: Option B Explanation:

5.  Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest. If she paid Rs. 432 as interest at the end of the loan period, what was the rate of interest?  
Answer: Option B Explanation:
Let rate = R% and time = R years.
12R^{2} = 432 R^{2} = 36 R = 6. 