What are the expected average quarterly costs of running a consulting practice if fixed costs are expected to month and variable costs are expected to be $$100$ per client for each quarter? Expected number of clients fo are:

$\backslash$table$[[$January$-$March,$110],[$April $-$ June,$140],[$July $-$ Sept,$150],[$Oct$-$Dec,$100]]$

$$12,500$

$$22,500$

$$17\mathrm{.}500$

$$27,500$