Whether it is a case of external or internal economies of scale:
A. A number of firms doing contract research for the drug industry are concentrated
Larger changes within the industry lead to external economies of scale, so as the industry expands, the average cost of doing business decreases. 
when external economies of scale exist?
External economies of scale take place when an industry as a whole expands and businesses profit from lower long-term average costs. External economies of scale are also known as advantageous external outcomes of industrial development.
 An external economy of scale is shared by competitors, internal economies of scale provide larger competitive advantages.
To learn more about external economies refer to:
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Answer:
The break-even point in economics, business—and specifically cost accounting—is the point at which total cost and total revenue are equal, i.e. "even". There is no net loss or gain, and one has "broken even", though opportunity costs have been paid and capital has received the risk-adjusted, expected return. 
Explanation:
 
        
             
        
        
        
The term is SOCIAL ENGINEERING.
Social engineering is the art of manipulating people into breaking information security procedures or to give away confidential information which they have at their disposal.<span />
        
                    
             
        
        
        
Explanation:
The journal entry are as follows 
On April 20
Sales returns A/c Dr $3,000
        To Account receivable A/c $3,000
(Being the sales returned of goods is recorded)
While recording this given transaction, we debited the sales return account and credited the account receivable account so that the proper posting could be done
 
        
             
        
        
        
Answer:
$5.31
Explanation:
Earnings per share = Earnings Attributable to Holders of Common Stock ÷ Weighted Average Number of Common Stocks Outstanding
<em>where,</em>
<u>Earnings Attributable to Holders of Common Stock is :</u>
Net Income                                                                       $650,000
Less Preference Stock dividend                                       ($71,000)
Earnings Attributable to Holders of Common Stock      $579,000
<em>and</em> 
<u>Weighted Average Number of Common Stocks Outstanding :</u>
Common Stocks at Beginning outstanding                                  100,000
Stocks Sold at Weighted Average (18,000 / 2)                                9,000
Weighted Average Number of Common Stocks Outstanding    109,000
therefore,
Earnings per share = $579,000 ÷  109,000
                                 = $5.31
The 2021 basic earnings per share is $5.31.