Numbers and percentage

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When x is decreased by 15% and then increased by 20%, it becomes y. How to find this value of y? Express x:y in its simplest form

The first step I done was to take away 15% from X which becomes 85% , how to do the next 20%?

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Hint:

You have: $$ y=x(1-15\%)(1+20\%) $$ because the value incremented by $20\%$ is $x(1-15\%)$.