Susan quit her job as a teacher, which paid her $36,000 per year, in order to start her own catering business. she spent $12,000 of her savings, which had been earning 10 percent interest per year, on equipment for her business. she also borrowed $12,000 from her bank at 10 percent interest, which she also spent on equipment. for the past several months she has spent $1,000 per month on ingredients and other variable costs. also for the past several months she has taken in $3,500 in monthly revenue.