Question

Dominic earns 285 per week plus an 8% commission rate on all his sales. If dominic sell 4213 worth of merchandise in one week how much will his total earnings for the week be?

Answer 1

Regardless of his sales, Dom earns $285 per week.
He also earns 8% on all his sales, that is, 0.08($4213) = $337.04.

Add these two amounts together to obtain Dom's total income for this week.

Note that this is a linear equation.  If E = earnings for the week, then

E = $285 + 0.08($4213).  Looks like E=salary + commission.