Q:
      
      
         
            
The bankers discount and the true discount of a sum at 10% per annum simple interest for the same time are Rs.100 and Rs.80 respectively. What is the sum and the time?
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: C) Sum = Rs.400 and Time = 2.5 years         
         
Explanation: BD = Rs.100
 TD = Rs.80
 R = 10%
 
 
 
BD = Simple interest on the face value of the bill for unexpired time= FTR/100
 
=> T = 2.5 years
       
      
      
      
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