I got this same question on a test, the answer is A.
 
        
                    
             
        
        
        
Answer:  $15 
 
Step-by-step explanation:
To find the markup price just multiply 30% by the amount. 
30% * 50  
 0.3 * 50 = 15
 
        
                    
             
        
        
        
a)  has CDF
 has CDF


where the last equality follows from independence of  . In terms of the distribution and density functions of
. In terms of the distribution and density functions of  , this is
, this is

Then the density is obtained by differentiating with respect to  ,
,

b)  can be computed in the same way; it has CDF
 can be computed in the same way; it has CDF


Differentiating gives the associated PDF,

Assuming  and
 and  , we have
, we have


and


I wouldn't worry about evaluating this integral any further unless you know about the Bessel functions.
 
        
             
        
        
        
Answer:A is correctly scientifically notated
B is incorrect
C is correctly notated
D is correct. 10 to the zero power simply means “1”
Step-by-step explanation: