John operates a small shop specializing in party favors. he owns the building and supplies all his own labor and money capital. Thus john incurs no explicit rental or wage cost. Before starting his own business john earned $1000 per month by renting out the store and earned $2500 per month as a store manager for a large department store chain. Because john uses his own money capital, he sacrificed $1,000 per month in interest earned on U.S. treasury bond johns monthly revenues from operating his shop are $10,000 and his total monthly expense for labor and supplies amounted to $6000. Calculate john monthly accounting and economic profit.