A toy store sold 405 dolls it sold equal number of dolls each month for 8 months and also sold a few extra dolls during the last month how many extra dolls were sold during the last month

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