John can produce 20 shoes or 200 shirts. Mike can produce 100 shoes or 200 shirts. What is John's opportunity cost for 1 shoe in terms of shirts given up?

How did emperor justinian’s review of roman laws create a more efficient legal system? a.he got rid of outdated and repetitive laws.b.he ranked the laws according to importance.c.he created new laws to address modern situations.d.he combined minor laws into stricter categories.ill mark brainliest

Are there any english colleges in south korea for americans that is international ?

What were 3 advantages to rail road growth