Charli has a 100$ bill. She goes to the mall to buy a new pair of shoes that have an original price of 75.60$. To her surprise she sees that the reteta 40% discount. How much
change will Charlie receive after she purchases the shoes?

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.