Question 1152039


let the original salary be {{{x}}}

then the new salary is {{{x-(m/100)x=(1-m/100)x}}}

To get back the original amount ,we find what must be multiplied to {{{(1-m/100)}}} to give {{{1}}}.

Let the number that will be multiplied to {{{(1-m/100)}}} to give {{{1}}} be {{{y}}}, then

{{{(1-m/100)y = 1}}}

{{{y = 1/(1-m/100) }}}

{{{y = 100/(1-m)}}}%

Therefore, the new salary must be raised by {{{100/(1-m)}}}% to bring it back to the original amount.