What formula gives annual monetary savings?

The formula that provides annual monetary savings focuses on the relationship between bill amounts and the energy units consumed. Understanding this concept requires knowing how energy consumption directly affects utility expenses.

When calculating annual monetary savings, it's essential to recognize that costs are incurred based on the energy consumed and the rate charged per unit. The correct choice suggests dividing the bill amount by the energy units consumed, which effectively translates to determining the cost per unit of energy. This relationship helps identify how much money can be saved by reducing energy consumption or finding more efficient energy solutions, leading to a better understanding of expenses related to utility services.

This approach captures the core principle of energy efficiency: saving money relies on reducing consumption or costs associated with energy. By establishing a baseline of the cost per unit, it becomes easier to project potential savings based on changes in consumption habits or efficiency measures.

In contrast, the other options do not directly provide insights into annual savings based on energy efficiency or consumption rates. They either represent ratios not relevant to determining monetary savings or are calculations that do not yield a clear understanding of how expenses scale with usage.