Answer:
Knowing how to calculate with percents is important because percents are a common way of expressing proportions or fractions. Percents are used in a wide range of applications in our daily lives, including calculating discounts and sale prices in shopping, determining interest rates and loan payments in finance, and understanding data and statistics in many fields. In the example given, calculating with percents is important for the shoe brand to determine the number of shoes they need to donate based on their sales. It is also important for customers to understand the impact of their purchase on children in need. Overall, being able to calculate with percents allows us to make informed decisions and understand the relationships between different quantities.