How to find percentage equivalent to a decimal Practice Test

Sally sees a jacket on sale that's . The store is having a storewide discount. What is the price of the jacket after the discount is applied?

A high school senior takes a survey of the entire senior class for a project. She's interested in seeing the distribution of what her peers decide to pursue in college. She came up with the following data:

The rest of the students stated an interest in Linguistics. How many students in total were surveyed?