A sole-proprietor sells a product for 9 per unit that costs 2 per unit from their supplier. The sole-proprietor began the day with 30 units in stock and 34 in cash. By the end of the day, they had sold 12 units of product and purchased for cash an additional 14 units for the following day. What is the difference (in s) between the profit for the day and the cash held at the end of the day? Please give your answer to the nearest whole number.