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.William 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.

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The Answer of 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.William 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.

Werner Installs Custom Sound Systems in Cars