Rena has to pay the first $100 of her medical expenses each year before she qualifies for her insurance company to begin paying. After paying the $100 "deductible," her insurance company will pay 80% of her medical expenses. This year, her total medical expenses came to $960.00. Which expression below shows how much her insurance company will pay?

A. 0.80(960 - 100)
B. 100 + (960 / 0.80)
C. 960(100 - 0.80)
D. 0.80(960 + 100)

To determine how much Rena's insurance company will pay, we need to subtract the deductible amount from her total medical expenses and then multiply it by the insurance coverage percentage.

First, let's subtract the deductible from the total medical expenses:
Total medical expenses - Deductible = 960 - 100 = 860.

Now, we can calculate the amount her insurance company will pay by multiplying this result by the insurance coverage percentage of 80%:
Insurance coverage percentage × (Total medical expenses - Deductible) = 0.80 × 860 = 688.

Therefore, the expression that represents how much her insurance company will pay is A. 0.80(960 - 100).