To find out how much Katie earned in total for the 4 weeks in January, we can start by calculating her commission earnings based on her sales for the month:
Commission earnings = 13% of sales = 0.13 x $3740 = $485.20
Then, we can add her commission earnings to her weekly base pay to find her total earnings for the month:
Total earnings = Base pay + Commission earnings
Total earnings = $150 x 4 + $485.20
Total earnings = $600 + $485.20
Total earnings = $1085.20
Therefore, Katie earned a total of $1085.20 for the 4 weeks in January