Janie spends 10 hours per week making flower arrangements. Yesterday she was offered an after-school job by the pet store in the mall, which she often visits to look at the animals. If she took this job working ten hours a week, she could make $2,500 per year. She has $600 invested in her flowers, and she could have that money earning interest at one percent per year in a savings account. What is Janie's total opportunity cost of staying in business for herself this year?