13. The amount earned (in dollars) for recycling p poundsof copper is 2p. How much do you eam for recycling28 pounds of copper?​

Answer:Money earned for recycling 28 pounds of copper is $ 56                  Step-by-step explanation:Cost of a given substance is the amount of money obtained or received for selling a given substance. The total money received for selling a given number of units or a given amount of substance is equal to the total number of units multiplied by the cost of one unit.Given: The money earned for recycling p pounds  of copper = 2pLet the money earned for recycling 28 pounds  of copper be $ x As, Money earned for recycling p pounds of copper = 2pSo, Money earned for recycling 28 pounds of copper = $ x ⇒ x = 2p × 28 ÷ p = $ 56Therefore, money earned for recycling 28 pounds of copper is $ 56.