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9.	A sum of money lent out at simple interest amounts to Rs. 720 after 2 years and to Rs. 1020 after a further period of 5 years. The sum is
	A.  Rs.500
	B.  Rs.600
	C.  Rs.700
	D.  Rs.710

Solution

S.I. for 5 year = Rs.(1020 - 720) = Rs. 300. S.I. for 2 year = Rs.(300/5×2) = Rs. 120. Principal = Rs. (720 - 120) = Rs. 600.

10.	A sum of Rs. 12,500 amounts to Rs. 15,500 in 4 years at the rate of simple interest. What is the rate of interest?
	A.  3%
	B.  4%
	C.  5%
	D.  6%

Solution

S.I. = Rs. (15500 - 12500) = Rs. 3000. Rate = (100×3000 / 12500×4)% = 6%.

11.	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%

Solution

S.I. for 3 year = Rs.(12005 - 9800) = Rs. 2205. S.I. for 5 year = Rs.(2205/3 ×5) = Rs. 3675. Principal = Rs. (9800 - 3675) = Rs. 6125. Hence, rate = (100×3675 / 6125×5)= 12%.

12.	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?
	A.  3.5 years
	B.  4 years
	C.  4.5 years
	D.  5 years

Solution

Time = (100 x 81 / 450 x 4.5)years ‹=› (8100/2025)years ‹=› 4 years.