Mr. white owns a stationery store and has noticed that his sales have been decreasing over recent years. people just aren't buying paper goods and writing materials like they used to, to the popularity of online communication. in 2010, mr. white's yearly sales were $180,000. he has noticed a decrease of $15,000 in sales each year since. what is the total of mr. white's sales from 2010 to 2015, inclusively? enter your answer in the box