Maya takes 8 hours to produce 1 mixer and 5 hours for 1 toaster

Miguel takes 20 hours for 1 mixer and 10 hours for 1 toaster

At which of the following prices would both Maya and Miguel gain from trade with each

other?

a.

4 mixers for 7 toasters

b.

8 mixers for 10 toasters

c.

12 mixers for 18 toasters

d.

Maya and Miguel could not both gain from trade with each other at any price.

why is the answer option A?