The sales person will make the highest earnings when he earns a graduated commission of 4% on the first $25,000 in sales and 8% on anything over that.
Sales people do not earn only a fixed salary. Most of the income of salespeople come in through commission on sales made. The higher the percentage of the commission, the higher the income of the sales person.
In the context of the question, the sales person will make the highest earnings when he earns a graduated commission of 4% on the first $25,000 in sales and 8% on anything over that.
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