Answer:
$855000
Step-by-step explanation:
Subtract $15,000 from each year's previous total and add them together, including the initial and final years because it is inclusive.
in the year 2010 his sales were 180,000 but after that he notices 15,000 less so he only made 165,000 you substrat 15 from 180 so you get 165,000 you multiplid 165 times 4. 164 x 4 = 660,000 only for those 4 years.
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