Short Answer 
The initial investment was $55 in certificates, and the total revenue from ticket sales was $100. The profit is calculated by subtracting the investment from the revenue, resulting in a profit of $45.
Step 1: Initial Investment
To calculate the profit, we first need to identify the initial amount invested. In this case, the amount is $55 which was invested in certificates. This sets the baseline for determining any financial gain or loss.
Step 2: Total Revenue from Ticket Sales
Next, we look at the total revenue generated from selling the tickets. The total sales amount to $100.00. This figure is crucial as it represents the total income received from the investment, allowing us to calculate the profit accurately.
Step 3: Calculating Profit
Finally, we calculate the profit by subtracting the initial investment from the total revenue. This can be computed as follows: Total Revenue – Initial Investment, which is $100 – $55 = $45. Therefore, the profit gained from this investment is $45.