A production team must purchase a computer with some given specifications (processor speed, memory size, etc.), and a 25-inch monitor. Computers have a mean cost of $3000, with a standard deviation of $500, while monitors have a mean cost of $600 and a standard deviation of $100. They plan to purchase a computer costing $2500 and a monitor costing $800. Which cost is the highest considering other appliances of the same type? Justify your answer.