Round #642

What is 15 percent of 80?

To find 15 percent of 80, you can use the following formula: \[ \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \] In this case, we want to find what part is 15% of the whole number 80. So, we rearrange the formula to solve for the part: \[ \text{Part} = \left( \frac{\text{Percentage}}{100} \right) \times \text{Whole} \] Substituting the given values: \[ \text{Part} = \left( \frac{15}{100} \right) \times 80 \] \[ \text{Part} = 0.15 \times 80 \] \[ \text{Part} = 12 \] So, 15 percent of 80 is **12**.

To calculate 15 percent of 80, you can use simple arithmetic. Here's how you can do it in C#: ```csharp using System; class Program { static void Main() { double number = 80; double percentage = 15; // Calculate the result double result = (percentage / 100) * number; Console.WriteLine($"{percentage}% of {number} is {result}"); } } ``` ### Explanation: 1. **Variables**: We define two variables, `number` and `percentage`, to hold the values 80 and 15 respectively. 2. **Calculation**: To find 15 percent of 80, we first convert the percentage to a decimal by dividing it by 100 (`percentage / 100`). Then, we multiply this decimal by the number (`(percentage / 100) * number`). 3. **Output**: Finally, we print the result using `Console.WriteLine`. This code is straightforward and follows C# best practices for performing arithmetic operations and outputting results.