Seth is paid on a graduated commission scale. He earns 10% commission on is first $1,000 in sales. He earns 15% commission on all sales over $1,000. Last month, his total sales were $2,500. What was his total commission?

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.

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