The services of most graphic designers can also be calculated in hours. For instance the standard rates for basic graphic design are approximately $ 80 per hour, for custom graphic design $160 per hour, for 3-D graphic design $250 per hour, and for prepress correction and graphic adjustments $ 80 per hour. Such types of calculation have greatly simplified the rate and cost problems of designing projects, as the designer is getting paid rationally if a certain project requires more time. Similarly, a client can give work in contracts that are based on hours.