1) Jessica purchases a watch on sale. The original price of the watch was $145, and Jessica pays $101.50. Determine the percentage discount Sheila received on the watch. 2) The Johnson family ate dinner at a restaurant. The total cost of the meal was $85.60. The family left a 15% tip for the waiter. How much was the tip left for the waiter from his family?

3) This year, Mrs. Stacey has 8 students who are new to the school. The number of new students represents 5% of all her students. How many students are in Mrs. Stacey's classes?

4) To receive a grade of A on an 80- question test, 90% of the questions must be answered correctly. What is the maximum number of questions that can be missed to still receive an A?