Economic profit = total revenue - economic costs = total revenue - (explicit costs + implicit costs) 
Bruce is a talented writer and graphic artist who enjoys both types of work equally. Instead of earning 45,000 dollars as a writer, Bruce now earns 25,000 dollars in accounting profits as a graphic artist using the same computer equipment he would have used as a writer. What is Bruce\textquotesingle s economic profit from choosing to work as a graphic artist? 
a: -45,000 dollars 
b: -20,000 dollars 
c: 20,000 dollars 
d: 45,000 dollars 
e: 70,000 dollars 