Need solving this pls show me how to solve it

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

I'm confused on this could anyone me and show me what i need to do to solve it.

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily