<h3><u>Answer</u>:- </h3>

<h3><u>Solution:-</u></h3>
<u>Given </u><u>that </u><u>:</u><u>-</u>
- job last for h hours 
 - Cost of job lasting more than 1 hour = $30
 - Cost for the first hour = $75 
 
Remaining hours for which the job will last after first hour= (h-1)
<u>Therefore</u>,
Cost for subsequent hours = 30×(h-1) 
= 30(h-1)
Total Cost for job = Cost for 1st hour + Cost for subsequent hours

 
        
             
        
        
        
I think you square the number as many times as there are people so that is,. 7*7=49
        
             
        
        
        
15 times 3 equals  45 hoped i helped