Even though the concepts are easy (nothing you cant do with a couple of excel/google docs formulas) I think it's quite nice if you want to do some basic startup pricing maths. A humble suggestion, you can improve the UI, i.e. reduce the video size (as suggested by others) or also give more visibility to calculated data in the page, i.e. "Units Required" and "Sales Revenue Needed" should be more clear and highlighted because they are actually (one of) the "result" of the calculation