Here is a pattern of squares. S represents the number of small squares in the pattern as a function of n, the step number.
Which expression could define S?
Select the correct choice.

There are a total sales of 2,000 dollars on monday on tuesday sales dropped 10% on wednesday sales dropped another 20% compared with tuesday from wednesday to thursday sales increases by an equal amount to 25% of monday total sales what is the net change in dollars on total sales from monday to tuesday