55.46 so estimating it would just leave it at 55
        
                    
             
        
        
        
Answer:
principal is the correct answer
Step-by-step explanation:
principal is the correct answer
 
        
                    
             
        
        
        
Given:
Charlie bought a new computer for $450 with his credit card.
He plans to pay the minimum payment  of $25 per month. 
To find:
The rate of change.
Solution:
Let y be the remaining amount of loan after x months.
Initial amount of loan = $450
Payment of one month = $25
Payment of x months = $25x
Now,
Remining amount = Initial amount of loan - Payment of x months
 ...(i)
     ...(i)
The slope intercept form is
 ...(ii)
     ...(ii)
where, m is slope and b is y-intercept.
From (i) and (ii), we get

Therefore, the rate of change is -25 dollars.
 
        
             
        
        
        
Class of students - number of students that are boys = numbers of students that are girls
30 - 13 = 17
To change the number of students that are girls into percentage...
17/1 * 1/100 = 17/100
17/100 in a % form = 17%
The percentage of girls in the class is 17%
        
             
        
        
        
First, find the 40% discount. 
40% of 195 is 78
195 x 0.40 = 78
Subtract that from 195
195 - 78 = 117
Now, find 66 2/3% of 117, since it is an additional reduction after the original discount.
2/3 = 0.667, so 66 2/3% is 66.667%
117 x 0.66667 = 78.00039
And subtract that from 117
117 - 78.00039 = 38.99961, which in dollars would be $38.99. (hundredths, etc. of a cent are usually just dropped; no rounding involved.)
The discount price would then be $38.99