I lost my wallet and the money in that. But I remember that before I lost my wallet I purchased to things. First one I purchased by paying 10% of what in my wallet and also for second one i also pay 10% of what has been left in my wallet- that is equal to 9. then how much money I lost? A.81 b.25 c.63 d.54

• Let total amount be 'x'
  10% is spent on 1st item
  therefore amount spent on 1st item=x*(10/100)=x/10
  amount left=x-(x/10)=9x/10
  %of amount spent on 2nd item=10%
  amount spent on 2nd item=9(given)
  amount spent on 2nd item=(9x/10)*(10/100)=9
  x =100
  money left in the wallet=money lost
  x-(x/10)-9=money lost
  100-(100/10)-9=81(A)
• 8 years agoHelpfull: Yes(18) No(0)
• It's% so let's assume the amount as 100
  1st thing 10% of 100=10
  2nd thing 10% of 90=9
  10+9=19
  Remaining amount=100-19
  =81
• 8 years agoHelpfull: Yes(5) No(0)
• let I have x rupee in my wallet
  then when i have purchased first thing i left with=( 90*x)/100; now the price of second thing was 10 % of money which i had left i.e. 9
  now ((90*x)*10)/(100*100)=9
  so x=100
  i lost money=100-10-9=81
  
• 8 years agoHelpfull: Yes(2) No(0)
• ex money in the wallet=x
  to purchase 1st thing: 10%x =y
  ==>> x=10y
  to purchase 2nd thing: 10%(x-y)=9
  x-y=90
  10y-y=90
  y=10
  so x=100.
  for 1st thing: 10 rs & for 2nd thing: 9 rs.. total = 19
  remaining lost amount=81 rs
• 8 years agoHelpfull: Yes(1) No(1)
• let in wallet money =100rs
  1st purchase=10%of 100=10rs
  remaining rs=90
  then 2nd purchase=10% of remaining mney=rs 9
  so paid amount=10+9=19
  then lost money=100-19=81
• 8 years agoHelpfull: Yes(1) No(0)
• let number be 100.
  10% of 100 = 10.
  10% of remaining i.e 90 = 9
  money lost = 100 - 19 = 81.
  
• 8 years agoHelpfull: Yes(1) No(0)
• 81(a)
  10%=rs 9 that is (9*100)/10=90,
  (90*100)/10=900,
  from that info if we had subtract the given info then it is 81
  
  
• 8 years agoHelpfull: Yes(0) No(0)
• let in wallet money =100rs
  1st purchase=10%of 100=10rs
  remaining rs=90
  then 2nd purchase=10% of remaining mney=rs 9
  so paid amount=10+9=19
  then lost money=100-19=81
• 8 years agoHelpfull: Yes(0) No(0)
• 1st--10%of x
  2nd--10%of90%of x =9
  x=100
  now,100-10-9=81
• 8 years agoHelpfull: Yes(0) No(0)
• 100 - 10% = 10
  100- 10 = 90
  10% of 90 is 9
  so he spent 18 rs and remaining is 81 rs
  
• 8 years agoHelpfull: Yes(0) No(0)