We are given equation c=50p.
c is the total cost and p is the number of people.
Let us take number of people by groups of 10, 20, 30,40 people.
Note: We can take any positive integer for number of people in a group.
Now, we need to plug p=10, 20, 30,40 one by one in given function c=50p to find the costs c.
Plugging p=10, we get 
c= 50*10 = 500.
Plugging p=20, we get 
c= 50*20 = 1000.
Plugging p=30, we get 
c= 50*30 = 1500.
Plugging p=40, we get 
c= 50*40 = 2000.
So, we can create a table as.
Number of people (p)           Total cost (c)
--------------------------------------------------------------------
          10                                      500
          20                                     1000
          30                                     1500
          40                                     2000
 
        
             
        
        
        
Answer: 164.45
Step-by-step explanation:
 
        
                    
             
        
        
        
4.6 turned into a fraction is 4 6/10= 4 3/5
4.6= 4 3/5.
4 3/5 is simplified.
        
                    
             
        
        
        
Infinite solution Bc both sides are equal
        
             
        
        
        
0.48 miles
Step-by-step explanation:
Step 1
It is given that the grade(slope) is 4%. This means that for every 100 miles traveled, the elevation changes by 4 miles. 
Step 2
Hence for a distance of 12 miles , the elevation changes by 12*4/100 = 48/100 = 0.48 miles. [Using direct proportion]