The answer is $7 because Marginal revenue is the change in total revenue from 10 customers ($400) to 11 customers ($407)  How a monopolist maximizes profits
How does a monopolist determine its profit-maximizing level of output How does it determine the price that it charges?
The monopolist will select the profit-maximizing level of output where 
                                        MR = MC
 and then charge the price for that quantity of output as determined by the market demand curve. If that price is above average cost, the monopolist earns positive profits.
How a monopolist maximizes profits 
 Because Chuck, a sole commercial airplane operator in small isolated town, has no  competition, he has complete control of market price of air travel in his small tone
  Reduced price → increase in ticket sales 
  Monopoly maximizes profit by choosing an amount of profit in which marginal revenue  equals marginal cost (MR= MC)  Since Chuck must reduce his price to sell more units, he has an incentive to sell a  smaller quantity than a perfective competitive company
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Answer:
c. seller receives cash sooner than if credit is granted directly to the customers
d. may allow seller to increase sales volume
Explanation:
When a customer uses a credit card, the bank that issued the card pays the seller immediately, and later, the bank recovers the money plus interest from the customer.
So this method allows for a faster collection of cash (basically immediatly) than if the seller granted the credit directly to the customer.
Credit cards also allow seller to increase sales volume because many people lack the cash necessary to pay down the full value of the purchase. 
 
        
             
        
        
        
The companies that paid dividends for 100 consecutive years is: b. Stanley Works c. Corning Glass Works, d. Pullman, Inc.
<h3>What is dividend?</h3>
Dividend can be defined as the money a company or an organization paid yearly to their shareholders and the money the company paid to their shareholders are  from the profit they make or generated.
Shareholders often invest their money in a business  or buy part of a company shares in which they in turn receive profit from the company they invested their money into.
Stanley Works, Corning Glass Works and Pullman, Inc. are the companies that has been paying dividend to their shareholders 100 consecutive years.
Therefore the companies that paid dividends for 100 consecutive years is: b. Stanley Works c. Corning Glass Works, d. Pullman, Inc.
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Informational interview is were you get information like for example how people on talk shows interview people.... a job interview is to not get information but its to get a job... one way its benefitial is that one you get information and two it helps you to understand things from their point to view... two questions i would ask in an informational interview would be ''whats your point of view'' and ''whats something you would want people to know about this that they don't already know... hope this helps!!! :)