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11.	The banker's discount on a certain sum due 2 years hence is 11/10 of the true discount.The rate percent is
	A.  11%
	B.  10%
	C.  5%
	D.  5.5%

Solution

Let T.D be Rs 1.Then, B.D =Rs.11 / 10 = Rs.1.10. Sum =Rs.(1.10 x 1/ 1.10-1) = Rs.(110 / 10) = Rs. 11. S.I on Rs.11 for 2 years is Rs.1.10. Rate =(100 x 1.10 / 11 x 2)% = 5%

12.	The present worth of a certain sum due sometimes hence is Rs.1600 and the true discount is Rs.160.The banker's gain is
	A.  Rs.16
	B.  Rs.24
	C.  Rs.20
	D.  Rs.12

Solution

B.G Given,T.D = 160, P.w= 1600 = (T.D)² / P.W = Rs(160 x 160 / 1600) = Rs.16.

13.	The banker's discount on a bill due 4 months hence at 15% is Rs.420. The discount is
	A.  Rs. 400
	B.  Rs. 360
	C.  Rs. 480
	D.  Rs.320

Solution

T.D = B.D x 100/ 100+(RxT) = Rs[420x100/100+(15x1/3)] = Rs.(420x100 / 105) = Rs.400.