Study the information provided below and answer the following questions$\mathrm{.}4\mathrm{.}1.$ MC Electronics supplies microcomputer circuitry to a company that incorporates microprocessors into the production of refrigerators and other home appliances. One of the components has an annual demand of $25000$ units, and this is constant throughout the year. Carrying cost is estimated to be R$15$ per unit per year, and the setup cost is R$300$ per order$\mathrm{.}4\mathrm{.}1\mathrm{.}1.$ To minimize cost, how many units should be ordered each time an order is placed?