Answer:
opportunity cost = 30,000
Step-by-step explanation:
The opportunity cost is the return in the alternative investment:
250,000 x 12% = 30,000 opportunity cost
The economic profit would be the lease less the opportunity cost
35,000 - 30,000 = 5,000 economic profit
Note: If there was two or more alternatives, we should pick the investment with the highest yield.