A civic group is selling bumper stickers as a fundraiser. In the first week 200 bumper stickers were sold. During the second week, the group sold 40% more bumper stickers than the first week. During the third week, the group sold 40% fewer bumper stickers than the second week
What is the percent decrease of the third week's sales over the first week's sales?
%

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f is the midpoint of

the linear relationship that represents a variation in direct proportion is the linear function that varies according to the numbers of its domain, for example the cost of producing x number of items can be represented in direct proportion by f (x) = mx + b, where m is the constant of proportionality, x the number of articles produced and b the fixed cost