How is a debit card similar to an ATM card? a.
Each is only available to adults 18 and older.
b.
Any one person can only have one of each at a time.
c.
Both can be used to withdraw money from ATMs.
d.
Both can be used to make purchases online.

0 bushels of corn 72 cars

Step-by-step explanation:

Melissa produces at the rate:

1 bushel of corn  per 8 hrs

Wash and polish a car per  2 hrs

She will wash and polish  cars  because she has the comparative advantage of requiring less time  ( 2 vs 8 hours)

Greg also will only wash and polish cars because he requires 8 hours to produce a bushel of corn vs 1 hour to wash and polish a car

Therefore  both Melissa and Greg  will wash and polish cars in the 48 hours:

Melissa will work on 24 cars since she requres 2 hours and Greg will produce 48 cars since he needs only an hour per job.

The total corn produced will be 0 bushels and  72 cars ( 24 + 48 )