Calculate price in Item class, but via receipt method in Receipt class
Increment item quantity when items added to cart
Receipt method prints out info for each item in cart
Print total sales tax for each cart
Fix bug by changing item to self for taxable imported items
Add remove item from cart method and update quantity method. Receipt now only prints out info for unique members of array
Fix update quantity method
Update the update quantity method
Receipt prints out correct totals. but if run receipt method again will add everyting again.'
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Fix bug by resetting sales tax and total price to empty array before calculating total. Add view cart method.
Refactor code