Answer
${$50}$
Increases by ${$1.25}$/hour.
Work Step by Step
From part (b), the lawyer earns ${$4,000}$/week, so when the government takes 25% of that as tax, they take ${$1000}$ in tax, and distributed among 20 workers, each worker will receive ${$50}$.
Divided over the number of hours, a minimum wage worker's hourly pay increases by $\frac{$50}{40}$ = ${$1.25}$/hour.
