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

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

+ Answer
C 

+ Explanation
Sum`= (S.l. xx T.D.)/((S.l.) - (T.D.))`

`= (85 xx 80)/(85 - 80)`

`= Rs. 1360.`

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Irin Moni

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