Question 188760
let the original cost be x
:
{{{x+x/100(x)=75}}}
:
{{{x+x^2/100=75}}}
:
{{{x^2+100x-7500=0}}}
:
{{{(x-50)(x+150)=0}}}
:
x=50,-150.....reject the negative
:
x=$50 orginal cost