Answer:
one-third of a one
Explanation:
Opportunity cost refers to the cost of choosing some other alternative over other which means that a person have to sacrifice or foregone something to get something else.
Rosa:
can produce 6 basketballs per hour or 2 footballs per hour
Dirk:
can produce 3 basketballs per hour or 4 footballs per hour
Hence,
Rosa’s opportunity cost of one basketball = (2 ÷ 6)
= 0.33 football or one - third of a one