The manufacturing costs of Calico Industries for three months of the year are as follows:

Using the high$-$low method, the variable cost per unit and the total fixed costs, respectively, are

a$.$ $$2\mathrm{.}10$ per unit and $$5,405$

b$.$ $$3\mathrm{.}78$ per unit and $$5,405$

c$.$ $$0\mathrm{.}21$ per unit and $$54,050$

d$.$ $$0\mathrm{.}38$ per unit and $$27,025$