Boyce Inc is a retailer of automobile tyres. All of the tyres purchased by the firm from overseas suppliers is identical. The opening inventory of the tyres and purchases during the month of November $2018$ were as follows:

$\backslash$table$[[$Date$,$Inventory$/$Purchases$,$Sales$],[$Opening inventory,$50,000$ tyres @ $$50,],[$November $4,2018,100,000$ tyres @ $$45,100,000$ tyres @ $$65$