Maddie buys 3 sodas for $2 each. she pays with cash and receives $4 in change. write an equation that can be used to find d, the number of dollars she paid with?

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?