Based on the figure below,in which eon did the percentage of continental crust increase the greatest amount? 
Definitions:
Fixed Expenses
Costs that do not fluctuate with the level of production or sales, such as rent, insurance, and property taxes.
Margin of Safety
The difference between actual or projected sales and the break-even point, measured to assess the risk of loss.
Sales
The total revenue earned from the sale of goods or services over a specific period of time.
Degree of Operating Leverage
The degree of operating leverage is a measure of how revenue growth translates into growth in operating income, indicating the sensitivity of operating income to changes in sales.
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