2. Belinda sells furniture at the Fantasy Furniture
Company. She earns $430 plus 2% commission on
her sales each week. Last week her sales were
$12,470. How much did Belinda earn last week?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.