If the price of petrol increases 30% and babu intends spend only an additional 10% on petrol,by how much percentage should he reduce the consumption

• let petrol price be 100 rs.
  new price is 130rs.
  but he spend addditional only 10 rs so he spend 110rs only
  no use percentage 110 is apprx 85% of 130
  .so he reduces 15%aprox..i.e ans
• 10 years agoHelpfull: Yes(16) No(0)
• let initially he used A litres @ xrs/l
  after hike he will spend 1.1 times A*x
  also after hike price of petrol 1.3xrs/l
  let after hike his consumption be Blitres
  hence 1.3x * B = 1.1 * A *x
  B=11/13 A
  A-B = 2A/13
  % = ((2A/13)/a ) * 100
  = 15.38%
  
  
• 10 years agoHelpfull: Yes(9) No(2)
• ans will 15.38
• 10 years agoHelpfull: Yes(5) No(2)
• ans will be
  15.38
• 10 years agoHelpfull: Yes(1) No(2)
• he should reduce by 15.07 %
• 10 years agoHelpfull: Yes(1) No(3)
• P X Q = E
  100 x 100 = 10000
  130 x Q = 10000 x (110/100)
  Q = 11000/130 = 84.6
  % change in quantity is ((100-84.6) X 100)/100
  = 15.3%
• 6 years agoHelpfull: Yes(1) No(0)
• Ans is:15.38%
• 10 years agoHelpfull: Yes(0) No(1)
• he should reduce by 15 %.
• 10 years agoHelpfull: Yes(0) No(2)
• new price of petrol=130
  spend additional=110
  so increment only 20%
  as per rule=r/(r+100)=20/120=0.1666*100=16.66%
• 9 years agoHelpfull: Yes(0) No(1)
• use the formula %change=a+b+(ab/100)
• 8 years agoHelpfull: Yes(0) No(1)