Blowave Ltd sells Turbo$-$blow brand hairdryers to salons. The annual demand is approximately $1200$ hairdryers. The supplier pays R$28$ for each hairdryer and estimates that the annual holding cost is $30\%$ of the hairdryer's value. It costs approximately R$20$ to place an order $($managerial and clerical costs$).$ The supplier currently orders $100$ hairdryers per month in one single order.