By selling 32 books for Rs. 100/- a man loses 40%. How many books shall he sell for Rs. 100/- to gain 20%?

• C.P = (100/(100-L%))*S.P
  C.P of 32 books is,
  32C.P = (100/(100-40))*100
  32C.P=(100/60)*100
  C.P=(100*100)/(60*32)
  C.P=125/24------------------(1)
  C.P = (100/(100+G%))*S.P
  C.P of x Books is,
  x C.P= (100/(100+20))*100
  x C.P=(100/120)*100
  C.P=(100*100)/120x
  C.P=250/3x-------------------(2)
  From (1)&(2),
  125/24 = 250/3x
  3x = 250*24/125
  3x = 48
  x = 16
  16 books
• 12 years agoHelpfull: Yes(22) No(0)
• 16 books
  60 ---- 100/32
  120-----100/x
  so x=16
• 12 years agoHelpfull: Yes(16) No(0)
• c.p.=(100/60)*100/32
  =125/24
  now new s.p.=(120/100)125/25
  s.p. of 1 book =25/4
  ? book in 100
  books=100*4/25
  16 book
• 12 years agoHelpfull: Yes(13) No(3)
• since he get 1920/- by selling 32 books on 60/-prize(40% of 100)
  therefore he has to sell 16 books 4 getting same amount i.e. 1920/120=16
  so ans is 16
• 12 years agoHelpfull: Yes(2) No(0)
• 
  16 books
  
• 12 years agoHelpfull: Yes(1) No(2)
• cp of 1 book=((100/60)*100)/32=250/32.....(i)
  let he sell x books at sp of 100...so cp of 1 books=((100/120)*100)/x..(ii)
  (i)=(ii)
  250/32=250x/3
  so x=32/3...so approx 10 books...
  
• 12 years agoHelpfull: Yes(1) No(6)
• 0.6x=100/32
  1.2x=! ==2*100/32=100/16
  so he need to sell 16 books
  
• 8 years agoHelpfull: Yes(0) No(0)