Answer: Change he would get = 50- 40p
Joshua will receive $48.8 if he buys three pounds of banana.
Explanation:
Given: Cost per pound of banana = 40 cents= 0.40 dollars [1 cent = 0.01 dollar ]
Number of pounds bought = p
Now, total price need to pay = (Cost per pound of banana) x (Number of pounds bought ) = 0.40p
Now, He pays the clerk with a fifty-dollar bill.
So, the change he would get = 50- 0.40p , which is the required expression.
When p= 3
then, change he would get = 50-0.4(3)=50-1.2 = $48.8
Joshua will receive $48.8 if he buys three pounds of banana.