Bills accounting profit is equals to revenue ($250,000) minus explicit (monetary) cost (50,000 and 30,000), while his economic profit is equals to accounting profit minus implicit (opportunity) cost (3,000 and 100,000). Accounting profit is $170,000 and Economic profit is $67,000.
Economic profit is always lower than accounting profit because explicit costs and implicit costs are both deducted to revenue. Implicit costs are cost that he should have earned if he gives up his present resources. These costs are projected cost and are not yet incurred.