If r(x) equal 3x -1 and s(x) equal 2x + 1 which expression is equivalent to (r/s) {6}

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