Quik Trip has been selling its pet e-mouse for $55 each. Quik Trip's variable cost is $24 per unit. At that price Quik Trip has been selling 24,302 units per year. Quik Trip is thinking about reducing its price by $5.05 per unit. At the same time, Quik Trip expects to be able to reduce variable cost by $1.23 per unit. By how many UNITS must Quantity demanded change for Quik Trip to just break even on these changes in price and variable cost? (Rounding: tenth of a unit. Use a negative sign if your answer is negative.)