Given f(x)= x-1/2, solve for f^-1(5)

Alrighty, a hack I will hsow you

if f(a)=b then f⁻¹(b)=a
and
if f⁻¹(a)=b then f(b)=a

so we want to find f⁻¹(5)=?
well, by the above 'hack', if f⁻¹(5)=z then f(z)=5

find what value of x will make f(x)=5

times 2 both sides
10=x-1
add 1
11=x

the answer is 11

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The percent increase is 25%