If the cost price of an item is x rupees, it was sold out after the successive discounts of y% and z% then what is the selling price of the item?

Interview Candidate
Jun 21st, 2005
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gopal

Dec 1st, 2006

let x=100, y=10% and z=10%
discounting at y% means discounting at 10% which comes to 100-10% of 100
let this be n. so n=100-10=90
now successive discounting at z% ie 10% 90-10% of 90
=90-9=81
so to mention in terms of alphabets let n=x-x*.y, final solution = n-n*.z