When a broker-dealer maintains a firm market in a stock, that broker-dealer is committed to purchasing or sale of up to the stated maximum number of round lots (the standard trading unit of the stock) at the stated price.
This is further explained below.
<h3>What is a 
firm?</h3>
Generally, A company providing professional services for compensation, such as law or accountancy, is called a "firm." One key tenet of "theory of the company" is that enterprises' primary purpose is to increase shareholder wealth.
In conclusion, By keeping a "firm market," a broker-dealer promises to buy or sell up to the maximum number of round lots (the stock's standard trading unit) at the quoted price.
Read more about the firm 
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Answer:
Contribution percent = 75%
Explanation:
Given:
Total sales = $24,000
Total Variable cost = $6,000
Total units = 6,000
Contribution percent = ?
Computation of Contribution :
Contribution = Total sales - Total Variable cost
Contribution = $24,000 - $6,000
Contribution = $18,000
Computation of Contribution percent :
Contribution percent = Contribution / Total sales
Contribution percent = 18,000 / 24,000
Contribution percent = 0.75
Contribution percent = 75%