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5.	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.650
	B.  Rs.690
	C.  Rs.698
	D.  Rs.700

Solution

S.I. for 1 year = Rs.(854 - 815) = Rs. 39. S.I. for 3 year = Rs.(39×3) = Rs. 117. Principal = Rs. (815 - 117) = Rs. 698.

6.	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 = (100×81/ 450×4.5)years ‹=› 4 years.

7.	A certain amount earns simple interest of Rs.1750 after 7 years. Had the interest been 2% more, how much more interest would it have earned?
	A.  Rs.35
	B.  Rs.245
	C.  Rs.350
	D.  cannot be determined

Solution

We need to know the S.I., principal and time to find the rate. Since the principal is not given, so data is inadequate.

8.	What is the present worth of Rs. 132 due in 2 years at 5% simple interest per annum?
	A.  Rs.112
	B.  Rs.118.80
	C.  Rs.120
	D.  Rs.122

Solution

Let the present worth be Rs.x. Then,S.I.= Rs.(132 - x). ‹=› (x× 5 × 2/100) ‹=› 132 - x ‹=› 10x = 13200 - 100x ‹=› 110x = 13200 x= 120.