EZ Co. produces and sells coffee brewing machines that operate by loading individual, prefilled cups of coffee. EZ sells to retailers the brewing machines for $75 and the prefilled cups (pack of 25 for $12). The customer cannot operate the machine without the cups and these cups cannot be purchased from other vendors. EZ expects that the retail customer will by 12 refill packs through each year of the machines useful life. How many performance obligations are in the contract