Take your time, and ask questions to narrow down the choices. Is this just households (for example)? If yes, logically think through the steps: the US population is an estimated 307 million. Assuming there are about 112 million households out there, that works out to about 3 people per household (just under). The average house probably has a dining area and an oce room. Assuming there are an average of 4 chairs total amongst both rooms, you can begin to estimate the "household" demand for chairs by working backwards from there. 3 people x 4 chairs = 12 x 112M