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From what I can observe, the problem involves:

1. A store selling tables and stools with given costs and markup policies.
2. Writing an equation for the retail price $R$ in terms of the cost $C$.
3. Finding the retail price of a table and the cost of an item with a known retail price.

Let's break down the problem step by step and solve it:

Problem Summary:

• The store sells tables and stools.
• Tables cost between $150 and $200, and stools cost between $25 and $51.
• Markup policy:
  • For items over $50, there's a specific markup formula.

Questions:

1. Write an equation that expresses the retail price $R$ in terms of the cost $C$.
2. Find the retail price for a table that costs $157.
3. Determine the cost of an item with a retail price of $193.50.

Would you like me to proceed with solving these steps, or would you like to clarify any part of the problem further?