You nave only two hours to study for two tests. Based on your past grades and cur rent work in each subject, you believe that if you devote all your time to economics and ignore English, you will make a 93 on your economics test and a 72 on your English test. However, if you switch and study only English and ignore economics, the result will be a 91 in English and an 83 in economics. What would your oppor tunity cost be if you chose this second option