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Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is:

Rs. 1550
Rs. 1650
Rs. 1750
Rs. 2000

Correct Answer: Rs. 1750

Explanation:

C.I.

= Rs.	[	4000 x	❨	1 +	10	❩	2	- 4000	]
					100

= Rs.	❨	4000 x	11	x	11	- 4000	❩
			10		10

= Rs. 840.

∴ Sum = Rs.	❨	420 x 100	❩	= Rs. 1750.
		3 x 8

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