M4maths Maths Puzzle Category

In Mac Donald following taxes are added on the price of purchased items.
1) Vat 12.5% of purchased items.
2) Service tax 4% of purchased items.
3) Edu. cess 2% of service tax.
4) Add. Ed. Cess 1% of service tax.
Diana went to Mac Donald with his daughter and they purchased some burger, Mc pizza & Coffee. Diana paid 932.96 rupee as bill. The cost of items without all taxes was

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The sum of x% of y and y% of z is z% of x. x and z are integers such that 1 =< x =< 9, 1 =< z =< 9. If y is a perfect square number then how many ordered pair (x, z) are possible satisfying the given condition. Mr. Brown tells to his son David that his age was 11 times that of Davids 15 year before. After two year his age would be x more than the sum of ages of his sons, here x is the present age of David. If brother of David is 8 years younger than David, then age of Mr Brown is