Task $2($green cells$)$:

Sheet "Task $2"$ extracts a few columns from sheet "Base".

Use sheet "Task $2"$ to calculate the Combined Checking and Savings for each customer and enter the results in the column "Combined Checking and Savings" $($green cells$).$ Then sort the records by the number of months as a customer of the bank. The most loyal customers should be at the top.

Please only enter a number $($no comma, no dollar sign, no decimal places, but a negative sign is allowed if applicable$).$

Identify the customer ID for the most loyal customers.