Ms. Jones makes a profit when she sells her desk for $100. If the desk costs her a whole number of dollars, her profit could be what percent of the cost to her?

To evaluate the options, test a whole number cost price (C) for the \$100 selling price (S) using the formula Profit Percentage equals (S - C) / C * 100. For a cost price of \$60, the profit is \$40, and the profit percentage is 40 / 60 * 100, which equals 66 2/3%. The other options would require fractional cost prices (such as \$66.67, $50, or $88.89), confirming that a cost of $60 yields the target percentage.

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