Q$1$: The Dayton company sells product Z$.$ During a move to new location, the inventory record for product $Z$ were misplaced. The bookkeeper has been able to gather some information from sales records and gives you the data shown below:

July sales : $53500$ units at $10$$ per unit

July purchases:

$\backslash$table$[[$Date$,$Quantity,Unit price$],[$July $5,10000,6\mathrm{.}5$$