In Swifty, maintenance costs are a mixed cost. At the low level of activity $(90$ direct labor hours$),$ maintenance costs are $$900.$ At the high level of activity $(500$ direct labor hours$),$ maintenance costs are $$2750.$ Using the high$-$low method, what is the unit variable costs and the total fixed cost for maintenance? $($Round variable cost per unit to $2$ decimal places.$)$

Variable Cost Per Unit

Total Fixed Cost

$$ $$5\mathrm{.}50$

$$248$

$$ $$4\mathrm{.}51,$$$1850$

$$ $$5\mathrm{.}50$

$$2250$

$$ $$4\mathrm{.}51$

$$495$