T.D. = [Amount x R x T] / [100 + (R x T)]
? 40 = [340 x R x 5] / [100 + 5R]
? 40 = (1700 x R) / (100 + 5R)
? R = 22/3%;
Req. amount = [81 x (100 + 6 x 5/2) x 100] / [(6 x 5/2)2]
= (8100 x 115) / 225
= Rs. 4140
Here, S.I. - T.D. = Rs. 81
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