today is March 20th, 2022. Imagine your friend, Liam, is planning to open a restaurant in April 2022. He already made a lease contract and paid $5,000 monthly rent from February. In March, because of the unexpected Covid-19, he cannot open the restaurant until May. From June, he can open the restaurant but the expected profit is $1,500 before paying rent. 1. What would you advise Liam after you learn the lesson of sunk cost today? 2. What is his today's sunk cost?