Colin was a professional classical guitar player until his motorcycle accident that left him disabled. After long months of therapy, he hired an experienced luthier (maker of stringed instruments) and started a small shop to make and sell Spanish guitars. the guitars sell for $700 and the fixed monthly operating costs are as follows: Colin's accountant told him about contribution margin ratios and he understood clearly that for every dollar of sales, $0.60 went to cover his fixed costs, and that anything past that point was pure profit. What is the amount of revenue Colin should earn each month to break even? $5, 833 $9, 952 $4, 968 $6.635