Cool Cradle, LLC is a one$-$product start$-$up company with an innovative new cradle that rocks itself. Answer the following $3$ questions using the sales forecast for number of units shown below, assuming they plan to start and end the year with $600$ units of inventory.

$\backslash$table$[[$Month Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oc$],[$Sales Plan $500,500,550,600,650,700,750,800,850,90(]]$