David earns $15.25 per hour, plus an additional 3% in commission of total sales. how much will david make in one month if he works 8 hours a day for 25 days and makes $2,050.00 in sales?

Earning rate  = $15.25 per hour + 3% of total sales

Total hours worked = (25 days)*(8 hours/day) = 200 hours
Total sales = $2,050.00
3% of total sales  = 0.03*($2050) = $61.50

Total earnings = (15.25 $/hour)*(200 hours) + 61.50
                         = $3111.50

$3,111.50