Final answer:
The restaurant makes a profit of £400.
Step-by-step explanation:
The restaurant makes 100 portions of curry, with each portion costing £3 to make.
Each portion is sold for £7.
To calculate the profit, we need to subtract the total cost from the total revenue.
Total revenue = 100 portions x £7 = £700
Total cost = 100 portions x £3 = £300
Profit = Total revenue - Total cost = £700 - £300 = £400
Therefore, the restaurant makes a profit of £400.