Answer:
A
Explanation:
Calculate the payback period and net present value for each project assuming a 10 % discount rate 
 
        
             
        
        
        
The reason of choosing of investment with high risk instead of one with low risk because the high risks stocks, bonds are having more returns as compared to low risks,  especially long term stocks.
<h3>What is high risk investment?</h3>
High risk investment is the one who have high chance of loss of capital or under-performance or have a great percentage of amount invested in some stocks.
Some high risk investments are Cryptocurrency, Individual Stocks, Initial Public Offerings, Venture Capital or Angel Investing, Real Estate and others.
Thus, The reason of choosing of investment with high risk instead of one with low risk 
For more details about high risk investment, click here:
brainly.com/question/27627260
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Answer: The invisible hand
Explanation: Invisible hand can be defined as those unobservable market forces which helps the forces of demand and supply to reach to an equilibrium level.
In the given case, Daniel is giving work to local suppliers and jobs to residents as well as producing demand in the market by its products, thus, we can conclude that the given case is an example of invisible hand.
 
        
                    
             
        
        
        
Answer:
A change in quantity demanded is caused only by
A) price
B) a shift
C) Market 
D) Income
The answer is Price(A) 
Explanation:
Hope this helps :D
 
        
                    
             
        
        
        
Solution:
Given Information,
Heat input is (  ) = 5.5 ×
 ) = 5.5 ×  Btu/h
 Btu/h
Combustion efficiency of the boiler ( ) = 0.7
) = 0.7
Combustion efficiency after turn up ( ) = 0.8
) = 0.8 
Operation Hour (t) = 5200h 
Unit cost (c) = 
Calculate heat output from the boiler   =
 =  x
 x 
                                                                       = 5.5 x  x 0.7
 x 0.7
                                                                       = 3.85 x  Btu/h
 Btu/h
Calculate the heat input to the boiler after the tune-up
 =
 =  /
 / 
                = 3.85 x  / 0.8
 / 0.8
                = 4.8125  x  Btu/h
 Btu/h
Calculate the saved energy after the tune-up
 =
 =  -
 - 
                  = 5.5 x  - 4.8125  x
 - 4.8125  x  Btu/h
 Btu/h
                  = 0.6875  x  Btu/h
 Btu/h
Calculate the annual energy saving (  )
 )
 =
 =  x t
 x t
            = ( 0.6875  x  Btu/h ) ( 5200 hr/yr)
 Btu/h ) ( 5200 hr/yr)
            = 3575 x  Btu/h
 Btu/h
Calculate the annual cost saving 
Annual cost saving =  x Unit cost
 x Unit cost
                                 = 3575 x  Btu/h x
 Btu/h x 
                                 = 82225