$2.$ Custom Commercial Printers $($CCP$)$ Ltd$.$ duplicates Prospectuses and Management

Information Circulars that are mailed out to companies$$ shareholders. CCP has two Integrated

Document machines, a new one and an old one, and both are fully utilized on every printing

job. The new one is faster than the old one, and as a result, $60\%$ of each job is printed on the

new machine and $40\%$ on the old machine. Overall, $4\%$ of the units produced in each print job

are defective, but it is known that the defect rate from the old machine is higher, at $7\%.100$

units of the most recent print job are stacked up in the fine paper recycling bin because they

are defective. Based on the information provided, what proportion was produced by the old

machine?