A rectangle plot was fenced without idea of its actual measurements . When measurements were known then it was found to have lost 20% of its length and 10% of its breadth. The Percentage of decrease in area is ?
Option
a) 28%
b) 18%
c) 13%
d) 26%
e) None

• formula is = x + y + xy/100 but lost
  -20-10 + ((-10)*(-20))/100
  -30 + 2
  -28%
  28 % decreses
• 9 years agoHelpfull: Yes(4) No(0)
• new length = 4/5 x
  new breadth = 9/10 y
  area = xy
  new area = 36/50 xy
  percent loss in area = {1-(36/50)}/100
  = 28%
• 10 years agoHelpfull: Yes(3) No(0)
• 28% is the answer
  let us have the initial area xy
  new area becomes 36/50xy which is 72% of original area. so,there is a lose in 28%.
  
• 9 years agoHelpfull: Yes(0) No(0)
• (a)28%
  Using Formula,
  X+Y+XY/100
  -20-10+((-10)*(-20))/100
  -30+200/100
  -30+2
  -28
  i.e. 28% loss or decrease
• 9 years agoHelpfull: Yes(0) No(0)
• let length be x and breadth be y
  then area=xy
  x-20%ofx=4x/5
  y-10%ofy=9y/10
  area=36xy/50
  then after dividing we get 72%
  so 100-72=28%
  
• 9 years agoHelpfull: Yes(0) No(0)
• ans a is correct
• 8 years agoHelpfull: Yes(0) No(0)
• a.28%
  assume total 100
  length has lost of 20% =80% and now10% on 80% we get 72% which is 100-72=28%
• 6 years agoHelpfull: Yes(0) No(0)