Please explain to me how I can do this .Sarah works in an appliance store. She gets a commission in addition to her hourly pay. She earns a 4%

Question

commission for sales up to $4000 and a 7% commission for all sales in a month above $4000. Last
month her sales were $5300. How much was her commission?

Answer 1

http://www.jiskha.com/display.cgi?id=1359518312