Please show calculation and formula, thank you

Question 8 (3 points) Saved A car rental company at a major airport has 70% of its fleet of 200 cars rented each day on average. Cars are rented for an average of 4 days. How many rentals are processed each day on average? a) More than 150 but less than or equal to 200 cars per day b) More than 100 but less than or equal to 150 cars per day c) c) More than 50 but less than or equal to 100 cars per day d) Less than 50 cars per day Question 9 (3 points) A wealth management company is able to process 300 customer statements per day. The average processing time per statement is two days. What is the average number of statements the company has in process at any time? a) 200 b) 600 C) 150 d) 450