A Towel ,when bleached, was found to have lost 20 % of its length and 10 % of its breadth. The percentage of decrease in area is?

• initial area=lb
  new area=0.8*0.9*lb
  decrease in area=initial area-new area=0.28lb
  28%
• 10 years agoHelpfull: Yes(1) No(0)
• a=l*b
  a(mf)=l(mf)*b(mf) where mf stands for multiplying factor
  
  now,
  l is reduced by 20%
  therefore its multiplying factor will be 4/5
  b is reduced by 10% its multiplying factor will be 9/10
  
  a(mf)=4/5*9/10
  a(mf)=18/25
  
  % reduction in area is 7/25*100=28%.
  
  
• 10 years agoHelpfull: Yes(1) No(0)
• 28% decrease in area of towel
  
• 10 years agoHelpfull: Yes(0) No(0)
• -20-10+200/100= -28%
  
• 10 years agoHelpfull: Yes(0) No(0)
• Suppose towel completely 100% length and breadth
  It's length decreases by 20%
  So 100*20/100=80%
  After that decrease breadth 10%
  So. 80*10/100=8%
  Total 80%-8%=72%
  We are suppose this length and breadth is 100%
  Then 100%-72%=28%
• 8 years agoHelpfull: Yes(0) No(0)