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### Discussion :: True Discount

1. The simple interest and the true discount on a certain sum for a given time and at a given rate are Rs. 85 and Rs. 80 respectively. The sum is:

2.  A. Rs. 1800 B. Rs. 1450 C. Rs. 1360 D. Rs. 6800

Sum =$$\frac { S.I*T.D } { (S.I)-(T.D) }$$=$$\frac { 85*80 } { (85-80) } =$$= Rs. 1360