Find the slope of the line that goes through the points 
and 
.
Definitions:
Mark-up
The sum added onto the purchase price of products to cover both overhead expenses and profit, establishing the retail price.
Markdown
A reduction in the regular selling price of a product or service.
Half-inch Plywood
A standard thickness of plywood, widely used in construction and carpentry, measuring half an inch.
Operating Profit
Earnings from a company's core business activities, excluding deductions of interest and taxes.
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