A watch was sold at a loss of 10 percent. If it was sold for $70 more, there would have been a gain of 4 percent. What was the CP of the watch?

Let the cost price be 100 percent, so the initial selling price at a 10 percent loss is 90 percent. The new selling price represents a 4 percent gain, which is 104 percent, making the difference 14 percent. This 14 percent equals the $70 difference, meaning 1 percent equals $5. The cost price is 100 percent, so multiplying by 5 gives $500.

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