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:
Rs. 1800
Rs. 1450
Rs. 1360
Rs. 6800
Explanation:
sum=$\dfrac{S.I \times T.D}{(S.I)-(T.D)}$
=>$\dfrac{85 \times 80}{(85-80)}$
=Rs.1360.
sum=$\dfrac{S.I \times T.D}{(S.I)-(T.D)}$
=>$\dfrac{85 \times 80}{(85-80)}$
=Rs.1360.