John decides to open a tutoring center for elementary school kids.

John decides to open a tutoring center for elementary school kids. His total revenue last year was $200,000. The rent on his building was $48,000, his labor costs were $42,000, and the materials, software, and other variable costs were $20,000. John could have worked as a teacher and earned $41,000 last year instead. An economist calculates John's implicit costs as O $0 $63,000 O $150,000 O $41,000