If Rs. 10 be allowed as true discount on a bill of Rs. 110 due at the end of a certain time, then the discount allowed on the same sum due at the end of double the time is:

A.
Rs. 20
B.
Rs. 21.81
C.
Rs. 22
D.
Rs. 18.33

• Option D is the right Answer.
  x is the percentage of rate which needs to be deducted after certain time
  110(x/100) =10 , x= 100/11. 2x will be 200/11
• 12 years agoHelpfull: Yes(5) No(0)
• given TD=10,A=110,Time=T,Rate=R
  So,TD=(A*T*R)/100+T*R =>10=(110*T*R)/100+T*R
  =>1000+10TR=110TR
  =>100TR=1000 :.TR=10
  substituting this TD'=(A*T*R)/100+T*R
  => 110 *2T*R/100+2T*R
  => 110*20/120
  => TD'=18.33
• 8 years agoHelpfull: Yes(0) No(0)
• SI ON ₹ (110-10) is Rs.10
  thus si on this sum for double the time will be ₹20
  Total discount on ₹120 is ₹20
  Hence discount on ₹110 will be 20*110/120 i.e. ; 18.333
• 7 years agoHelpfull: Yes(0) No(0)