price of petrol increase by 25%, kevin can increase only additional 15%on petrol. by wich % he shud reduce quantity of petrol purchased?

• Let, x litre of petrol and investment is Rs. 100.
  cost of 1 litre of petrol=100/x.
  Now, Increased price of 1 litre of petrol= 125/x.
  Quantity of petrol purched in Rs. 115= 115x/125.
  Reduce in quantity= x-115x/125=10x/125
  
  % reduce in quantity=(10x/125)*100/x
  =8%
• 12 years agoHelpfull: Yes(15) No(0)
• 8%
  let x/litre
  let initialy we have 100 rs
  so petrol get=100/x lit
  new prs=5x/4
  so,115/5x/4lit=92/xlit
  dif=8/x
  so 8%
• 12 years agoHelpfull: Yes(14) No(1)
• let he buy X Lit petrol for---- Rs 100
  after 25% increase, he buy X lit for---- Rs 125
  now, new price of 1 lit = 125/X
  let he can buy Y lit petrol for 125/X per lit for Rs 115
  therefore, (125/X)*Y = 115 ------eqn-1
  suppose we take X =100 in eqn-1(you can assume X equal to any number)
  we get Y=92
  therefore, he buys 8 lit less petrol now (X=100 Y=92 diff=X-Y)
  % dec= (8/100)*100=8%
• 12 years agoHelpfull: Yes(7) No(2)
• let initial price of 1 litre petrol=100 rp
  new price of petrol=125 rp
  amount he can afford=115 rp
  for 1 rupee he can buy=(1/125)litre petrol
  therefore for 115 rp=(1/125)*115=(23/25)litre
  so quqntity of petrol reduced=1-(23/25)=(2/25)
  so percentage reduced=2*100/25=8%
• 12 years agoHelpfull: Yes(4) No(1)
• easy method
  price spend/increase in price==> 115/125
  23/25 ... remaining = 2/25 *100 =8%
• 12 years agoHelpfull: Yes(4) No(0)