Final answer:
Purdy's profit margin is 5%, option A.
Step-by-step explanation:
Assets at the beginning = $800,000
Assets at the end = $900,000
The profit margin can be calculated by dividing net income by sales and multiplying by 100. In this case, the net income is $85,000 and the sales are $1,700,000.
Profit margin = (Net income / Sales) * 100
Profit margin = (85,000 / 1,700,000) * 100 = 5%.
Therefore, Purdy's profit margin is 5%, option A.