Many jobs have regular salary increases. That means you get hired at an initial yearly amount, and then it increases steadily some fixed amount each year. (If it increases a fixed percent each year, you would use a geometric sequence.) Here, we use a starting salary and known fixed raise to find how much a chef would make after a certain number of years, and how long it would take him/her to earn a given amount. If you wanted the sum of his/her earnings over time, you'd use an arithmetic series formula.
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