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An employee receives a weekly salary of $290 and a 4% commission on all sales. Write a rule to describe the function f(d) that gives weekly earnings...

45. An employee receives a weekly salary of $290 and a 4% commission on all sales.

a. Write a rule to describe the function f(d) that gives weekly earnings in terms of d dollars in sales.
b. Find the employee’s earnings for a week with $570 total sales.
c. What were the employee’s total sales for a week in which her earnings were $930?

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