These are estimation problems but I am not too sure on how to do them. Can you please show all steps required to produce the estimate and show the values for each step. Thank you.
a. How many grocery stores are there in the United States that are opened at least 12 hours per day?
b. How many calories are eaten across all preteens in the United States in one year?
c. How many pounds of chewing gum are stuck under desks, tables, chairs, etc. in the United States?
d. What is the total retail dollar value of all Coke and Pepsi carbonated soft drinks consumed each year in the United States?
e. What is the total retail dollar value of all Coke and Pepsi carbonated soft drinks purchased from vending machines in the United States?