13. The amount earned (in dollars) for recycling p pounds

of copper is 2p. How much do you eam for recycling

28 pounds of copper?

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 = 2p

Let the money earned for recycling 28 pounds of copper be $ x

As, Money earned for recycling p pounds of copper = 2p

So, Money earned for recycling 28 pounds of copper = $ x

⇒ x = 2p * 28 : p = $ 56

Therefore, money earned for recycling 28 pounds of copper is $ 56.