Quantitative Aptitude :: Percentage - Discussion

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Explanation:
Assume Lets total amount = 'x'
10% is spent on 1st item
=> amount spent on 1st item = x*(10/100) = x/10
So, amount left = x-(x/10) = 9x/10
Given: %of amount spent on 2nd item = 10%
Amount spent on 2nd item = 9
So, 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