A copy company wants to expand production. It currently has 20 workers who share eight copiers. Two months ago, the firm added two copiers, and output increased by 60,000 pages per day. One month ago, the firm added five workers, and productivity also increased by 50,000 pages per day. A copier costs about four times as much as a worker. Assume these increases in productivity per worker and productivity per copier are good proxies for future increases in productivity when hiring additional workers or purchasing additional copiers.

Based on this information, the copy company should in order to expand output.