You are a scientist studying beach erosion at your local beach. You have created a simple worksheet to calculate the yearly erosion rate and to perform some what-if analysis. The spreadsheet that you have so far is given below. 
Each month, you will enter the erosion per month (in centimeters). You then want Excel to automatically calculate Total Erosion (of all months) after you enter the erosion for each month. What would you need to enter to accomplish this, and what would the formula read in cell C15?
Definitions:
Activity Rates
The costs assigned to specific activities, used in activity-based costing to allocate overhead costs more accurately.
Activity Cost Pools
Categories in activity-based costing that aggregate indirect costs incurred by multiple cost objects, allowing for more precise allocation.
Activity-Based Costing
Activity-Based Costing is a method that assigns costs to products or services based on the activities they require, aiming for more accurate allocation of overhead.
Activity Rates
The costs associated with specific activities, used in activity-based costing to allocate overhead costs based on actual consumption.
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