Cost-benefit principle would state that you would only take an action if the benefit outweighs the cost. 
For example: It may cost me $5 to drive to work, but I make $50 for showing up, I would go because the benefit I get outweighs the cost and I am better off going than staying at home. 
 
        
             
        
        
        
The answer to your question is the area under the demand curve
        
             
        
        
        
Answer:
A
Explanation:
now am not sure but i think the answer is A
 
        
                    
             
        
        
        
The value of the CPI in 2006 is 82.61.
<h3>What is the value of the CPI?</h3>
The consumer price index measures the changes in price of a basket of good. It is used to measure inflation. Inflation is when there is a persistent rise in the general price levels.
CPI = (cost of basket of goods in current period / cost of basket of goods in base period) x 100
2010 is the base year because its CPI is 100.
(19,000 / 23,000) x 100 = 82.61
To learn more about consumer price index, please check: brainly.com/question/26382640 
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prepaid means already paid