In 2011, britney taught music and earned $20,000. she also earned $4,000 by renting out her basement. on january 1, 2012, she quit teaching, stopped renting out her basement, and began to use it as the office for her new website design business. during 2012, she paid $1,500 for the lease of a web server and $1,750 for high-speed internet service. she received a total revenue from web site designing of $45,000. normal profit (usual return of such an entrepreneur) is $25,000 a year. calculate britney's explicit costs, implicit costs, opportunity cost and economic profit in 2012. did britney operate her business at a profit or loss in 2012 (from economic viewpoint)? explain.