Questions $15-17$ based upon the following Information

Two Separate McDonalds store owners $5$ miles away from each other $($Danny and Joe$)$ produce two goods $($Big Macs and Quarter Pounders$).$ Consider their production decision over the course of a day. Each person is producing at full capacity at the levels below so any change in production of one item reflects a corresponding change in the other item.

Big Macs:

Quarter Pounders:

Danny:

$160$ per day

$40$ per day

Joe:

$160$ per day

$24$ per day

For every Quarter Pounder that Danny produces, what is his Opportunity Cost expressed in Big Macs?

$2$

$\frac{1}{2}$

$\frac{1}{4}$

$4$