The monthly salary is $2230 with a commission based on what she has sold (7% of the value). The question says that Barbara's sales were $35800. Therefore, to find the commission we have to multiply the sales by the percentage of 7%:
[tex]\text{Commission = 35800 }\times0.07\text{ = \$2506}[/tex]To find the total gross we have to sum the commission and the monthly salary:
[tex]\text{Total Gross = 2506 + 2230 = \$4736}[/tex]