I am having difficulty with this problem and I was wondering if anyone can talk me through it? Mr Smith starts a business with $50,000. 3 months later, Mr Jones joins the business. He invests $25,000 The profit at the end of the year is $11,000. It is divided in proportion to how much was invested and for how long. I know that I have to express the $11,000 as a fraction which can then be divided between the 2 men accordingly, but I have no idea how to achieve that! Can anyone help?