Nissan orders TunnelFire all$-$weather brand tires for its Nissan Leafs, where $4$ tires

$(1$ set$)$ are used per car. Nissan pays $$190$ for each tire and estimates that the annual holding

cost is $35\%$ of each tire$$s value. It costs approximately $$550$ to place an order $($clerical costs$).$

Nissan currently orders $2,000$ sets of tires per order. Use the demand$/$sale observations in the

past $12$ months to estimate the annual demand.

$($a$)$ Determine all relevant costs for the current order quantity $($denoted as COQ$).$

$($b$)$ Then, calculate the EOQ as w