The following data apply to a firm operating in perfect competition. | Quantity Total | Revenue Total | Cost | |----------------|---------------|-------| | 21 | $210 | $138 | | 22 | $220 | $145 | | 23 | $230 | $154 | | 24 | $240 | $165 | The firm's profit maximizing output (in units) is most likely: | Chartered Financial Analyst Level 1 Quiz - LeetQuiz