Answer:
Tax amount: $1.02
Total cost: $15.52
Explanation:
Givens
We are given that the price of popcorn is $11 and that the price of soda is $3.50.
We are also given that the tax rate was 7%.
We are asked to find the tax amount - in other words, we need to find 7% of the total of the entire transaction. We also need to find the total cost.
Solve
First, add together the price of the popcorn and the price of the soda:

Then, convert 7% to a decimal by dropping the percentage sign and dividing the value by 100:

Then, multiply the total by 0.07:

Finally, add this tax to the initial cost to determine the total cost:

Final Answer
Therefore, the tax amount is $1.02.
The total cost is $15.52.