$\backslash$table$[[21,,],[22,,],[23,$Objective,Total Production Cost$],[24,,$Inventory Holding Cost$],[25,,$Total Cost$],[26,,],[27,,],[28,$Subject to$,$Maximum Production Cap.$],[29,$Minimum Production Req.,$],[30,,],[31,$Maximum Stock Amount,$],[32,$Safety Stock,$],[33,,]]$

Consider Beyond Sports problem statement and figure above. Construct the formula that models the ending inventory of period $1($Cell $21).$