7.11 Drivers are concerned with the mileage obtained by their automobiles. One driver has kept track of several tankfuls of gasoline by recording the number of miles driven and the number of gallons used for each tankful. Develop a script that will take as input the miles driven and gallons used (both as integers) for each tankful. The script should calculate and output HTML5 text that displays the number of miles per gallon obtained for each tankful and the combined number of miles per gallons obtained for all tankfuls up to this point. Use prompt dialogs to obtain the data from the user. [Scroll down or expand this text area to view the rest of this assignment.]

Note 1: The "combined number of miles per gallon obtained for all tankfuls up to this point" is the total miles driven divided by the total gallons used.

Note 2: Chrome will not display the output of writeln until the end of the script. So, don't worry about this. I.e., it is OK that the output is delayed in this way. 7.12 Develop a script that will determine whether a department-store customer has exceeded the credit limit on a charge account. For each customer, the following facts are available: a) Account number b) Balance at the beginning of the month c) Total of all items charged by this customer this month d) Total of all credits applied to this customer's account this month e) Allowed credit limit

The script should input each of these facts from a prompt dialog as an integer, calculate the new balance (= beginning balance + charges - credits), display the new balance and determine whether the new balance exceeds the customer's credit limit. For customers whose credit limit is exceeded, the script should output HTML5 text that displays the message "Credit limit exceeded."

Create two .html files, one for each exercise.