Any article sold for less than that, is given away. Some products can be charged more according to the weather, but as a general rule of thumb there's no exception below that margin.
While roller coasters are the big money makers, it’s far better to have a few small rides turning a monthly profit (or good enough to allow the player to charge a decent entrance fee) to help offset some of the construction/landscaping/scenery costs.Before taking on large and costly projects (such as building a new roller coaster), having a basic park up and running is often advisable.In vanilla RollerCoaster Tycoon it is the player’s choice, but from Loopy Landscapes onwards this is predetermined by the scenario.Players should also check whether their park's a pay-per-entrance or a pay-per-ride park, so they can plan their expansion accordingly.Hiring the correct amount of staff members and giving them reasonable patrol areas is often a good idea. In already established parks, the starting staff is often inadequate to the park's needs.If there are any pre-built rides/attractions in the scenario, now is a good time to check their status and pricing information.It is also in most cases a good idea to sort out the park's research priorities now since in most cases (especially in the first two games) the research instructions are set with normal funds and on every branch of the research tree. This gives them a chance to familiarise with the park and get its finances in order. Players should pause the game at the start of each scenario.