Werner installs custom sound systems in cars.If he installs seven systems per day,his total costs are $300.If he installs eight systems per day,his total costs are $400.Werner will install eight sound systems per day only if the eighth customer is willing to pay at least:

A) $300.
B) $400.
C) $100.
D) $50.

Custom Sound Systems

Tailor-made audio setups designed according to the specific preferences or requirements of the user.

Total Costs

The sum of all costs associated with the production of a good or service, including both fixed and variable costs.

Eighth Customer

Refers abstractly to a particular order or position of a customer, often without a specific context.