Answer the following questions. 1) Solve the percent change problem using the proportion formula. List the information
given by each situation. Show the substitution into the proportional formula equation.
State the final result in a complete sentence using the appropriate unit.
A city has a sales tax rate of 9%. If Dion paid $6.30 in sales tax on a new guitar pedal, how much
was the purchase price of the pedal?
Increase or decrease:
O Increase
O decrease

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?