Question 1116968
x calculators at the regular price;
x+2 calculators at the new price;


{{{160/x}}}-----regular price


{{{160/(x+2)}}}------new price


New price is $4 less per calculator.

{{{highlight_green(160/x-160/(x+2)=4)}}}
This is the equation to solve.

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{{{40/x-40/(x+2)=1}}}

{{{(40(x+2)-40)/(x(x+2))=1}}}

{{{40x+80-40x=x^2+2x}}}

{{{x^2+2x-80=0}}}

{{{(x-8)(x+10)=0}}}

{{{highlight(x=8)}}}