Answer: $ -45,000
Explanation: Economic profit is the difference between accounting profit and opportunity cost.
Economic profit = Accounting profit - Opportunity cost
Sarah left her job as a real estate agent to become a yoga instructor. Therefore ,her opportunity cost is the income she forgoed to become a yoga instructor which is $100,000.
Her accounting profit is $55,000.
Economic profit = 55,000 - 100,000 = $-45000.
I hope my answer helps.
Goodluck