Final answer:
After deducting fixed costs of $600 and variable costs of $700 from the total revenue of $1500, James's profit for the day is $200.
Step-by-step explanation:
James sold 100 pizzas at $15 each, resulting in total revenue of $1500 (revenue = number of pizzas × price per pizza). To calculate the profit, we must subtract both fixed costs and variable costs from the total revenue. James's fixed costs are $600, and his variable costs are $7 per pizza, adding up to $700 for 100 pizzas (variable costs = number of pizzas × cost per pizza). The profit can be calculated as follows:
profit = total revenue - (fixed costs + variable costs)
Substituting the values we get:
profit = $1500 - ($600 + $700)
profit = $1500 - $1300
profit = $200
Therefore, James's profit after paying all of his expenses for the day is $200.