Mark and Julie Are Going to Sell Brownies and Cookies
Mark and Julie are going to sell brownies and cookies for their third annual fundraiser bake sale. In one day, Mark can make 40 brownies or 20 cookies, and Julie can make 15 brownies or 15 cookies. What is Mark's opportunity cost to produce one brownie?
A) 1 cookie
B) 1 brownie
C) 0.5 cookie
D) 0.5 brownie