In Bonita, maintenance costs are a mixed cost. At the low level of activity $(80$ direct labor hours$),$ maintenance costs are $$600.$ At the high level of activity $(500$ direct labor hours$),$ maintenance costs are $$1650.$ 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

$$2\mathrm{.}50,$$$1050$

$$3\mathrm{.}30,$$$2100$

$$3\mathrm{.}30,$$$132$

$$2\mathrm{.}50,$$$400$