Hi,
The total amount is $1,350.
So, firstly we'll start off with the easiest one. We know that they bought a cake for $250. We also know that there were 50 people invited. Appetizers per person cost $2. So we multiply $2 by 50 people. That's $100. They also charge $20 per person for the main course. Now we multiply $20 by 50 people and get $1,000. Now we add $1,000, $250, and $100 to get our total!
