If a stock car model is built to the scale of 1 cm : 2.5 ft and the model measures 7.7 cm in length, what will be the length of the actual stock car?

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