Katy earns a rebate each month on her meals and movie tickets. She earns $4 for each movie ticket and $0.60 for each meal. Last month Katy purchased 13 meals and earned $16. Part A: Create an equation that will determine the number of movie tickets she purchased. (3 points)

Part B: Solve this equation justifying each step with an algebraic property of equality. (6 points)

Part C: How many movie tickets did Katy purchase last month? Round to the nearest whole number.