Amy spends 70% of her income on household expenditure, 60% of the remaining on the education of her children and then 40% of the remaining is given to her old mother. Finally, she has US $576 in her hand. Her salary is __________.

a. US $6000

b. US $8000

c. US $9000

d. US $10000

• 70% of x=0.7x ,remaining amount=0.3x
  60% of 0.3x=0.18x ,remaining amount =0.3-0.18=0.12x
  40% of 0.12x=0.048 x,remaining amount=0.072x
  0.072x=576
  x=8000
• 12 years agoHelpfull: Yes(44) No(1)
• there is a shortcut
  if 70% expenditure then write it as 100%(100-30)
  if 70% income then write it as 100%(100+70)
  so according to this
  (100%30)*(100%40)*(100%60)*576=8000
• 12 years agoHelpfull: Yes(8) No(2)
• ans:b
  8000
  
• 12 years agoHelpfull: Yes(5) No(1)
• ans is b ....8000
• 12 years agoHelpfull: Yes(5) No(1)
• let her income be x
  1)then income left after household expenditure = 3x/10
  2)income left after educational expenditure of children = (3x/10)*4/10 = 12x/100
  3)money left after giving to her mother = (12x/100)*60/100 = 72x/1000
  4)this is equal to 576 so ==>72x/100 = 576 ==> x=(576000/72) = 8000
  5)hence her salary is $8000
• 12 years agoHelpfull: Yes(4) No(0)
• Let her total salary be x,then
  70% of x=0.7x (expenditure),remaining amount=0.3x
  60% of 0.3x=0.18x (education),remaining amount =0.3-0.18=0.12x
  40% of 0.12x=0.048x(old mother),remaining amount=0.072x
  given that money left=$576
  therefore 0.072x=576
  x=(576000)/72
  x=8000
• 12 years agoHelpfull: Yes(3) No(0)
• ans $8000
  let his salary be 100 so finally he left with 7.2
  so for 576 we get (576*100)/7.2 we get 8000
• 12 years agoHelpfull: Yes(2) No(0)
• can u plz explain the method?
• 12 years agoHelpfull: Yes(0) No(4)