The term for Total amount earned is GROSS pay. What you actually get after deductions is NET pay (take-home pay)

Convert 8.75% to decimal form by dividing by 100 or simply moving decimal point 2 places to left (.0875) Multiply that x sales ($3,792) to find commission and add that to $2,310 for GROSS pay.

Your other problem works the same way

Convert 8.75% to decimal form by dividing by 100 or simply moving decimal point 2 places to left (.0875) Multiply that x sales ($3,792) to find commission and add that to $2,310 for GROSS pay.

Your other problem works the same way