Answer:
With the definition of percentage. 20% of something means multiplying it by 20 and then dividing the result by 100. In our case,
![165.00 * 20 / 100 = 33.00](https://img.qammunity.org/2023/formulas/mathematics/high-school/rx8rkbbilhuguqcxz5nyr59x1wumurj2j5.png)
Alternatively, convert it into a fraction. 20 is 1/5 of 100 (alternatively, you need to pick 20 five times to get 100), and then you just multiply
![165.00 * \frac15 = 33.00](https://img.qammunity.org/2023/formulas/mathematics/high-school/soione1ojet03jt36q4bo1gdewvb31v1co.png)