Answer
\$86,000
Work Step by Step
Since Jen gave up another job to run the shop, her \$40,000 salary is part of the opportunity cost of running the business.
Jen could sell the building and earn interest on the sale price. That interest is part of the opportunity cost.
$I=200000\times0.08=16000$
Total cost=$40,000+16000+30000=86,000$