Final answer:
The expense ratio is calculated by dividing underwriting expenses by premiums earned and multiplying by 100. For the U.S. Property/Casualty industry in 2017, this calculation yields an expense ratio of 27.95%, which, when rounded to the nearest tenth, is 28.0%.
Step-by-step explanation:
The question pertains to calculating the expense ratio for the U.S. Property/Casualty insurance industry based on the 2017 financial data provided. To calculate the expense ratio, we divide the underwriting expenses by the premiums earned, then multiply by 100 to get a percentage. Here's the formula and calculation:
Expense Ratio = (Underwriting Expenses / Premiums Earned) × 100
Using the given numbers:
Expense Ratio = (151.1 billion / 540.6 billion) × 100 = 27.95%
However, when we look at the provided options, we must round to the nearest tenth to match the format, which gives us an expense ratio of 28.0%.