Fashion Hair is a hair salon. It planned to provide $240$ hair color treatments during December. Each treatment was planned to require $0\mathrm{.}6$ hour of labor at the standard labor price of $$25\mathrm{.}00$ per hour. The salon actually provided $250$ treatments. The actual labor price averaged $$22\mathrm{.}50.$ The labor price variance was $$450$ favorable.

Required

a$.$ Determine the actual number of labor hours used per treatment.

b$.$ Indicate whether the labor usage variance would be favorable $($F$)$ or unfavorable $($U$).$