Final answer:
The cost for seven hours of labor would be $725, based on an initial hour charge of $125 including inspection, and an additional $100 per hour thereafter.
Step-by-step explanation:
The question pertains to calculating the cost of seven hours of labor given different rates for one and four hours of labor. From the options provided, it can be inferred that there's a flat rate for an hour of labor plus an inspection, and a different total charge for four hours of labor without details on how that is broken down.
The student needs to determine the hourly charge rate and then apply it to seven hours. To do this, we subtract the cost of one hour of labor from the cost for four hours of labor to find the cost of the additional three hours. This gives us the hourly rate. Once we have the hourly rate, we can then find out the cost for seven hours of labor.
The cost for one hour of labor including inspection is $125 and the cost for four hours is $425. The additional cost for the three hours is $425 - $125 = $300. Thus, the cost per hour after the initial hour is $300 / 3 = $100. Therefore, the cost for seven hours would be $125 (initial hour with inspection) + $600 (additional six hours at $100 per hour), totaling $725.