I have to invest 10,000 euro in a doll shop. I use 1,000 to buy the license and 2,000 to buy shop equipment. In January 2018 I buy 800 dolls at 5 euro each. In February I start selling at 7 euro each. I buy 800 dolls per month and manage to sell them all. I have running costs of 800 euro per month. What is the Monthly Cash Flow for all the months of 2018?