A sales person earns commotion on the sales that she make each month The sales person earns a 5% commotion on the first $5000 she has in sales

The sales person earns 7.5% commotion on the amount of her sales that are greater than $5000

This month the sales person had $8000 in sales. What amount of commission, in dollars, did she earn?
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the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.