Newman-Elaine Inc. manufactures bicycles. The cost of producing a bicycle at the company's current activity level of 9,000 units per month is: Variable manufacturing costs per unit $100 Fixed manufacturing costs per unit $30 The normal selling price is $160 per bicycle. The company's total productive capacity is 10,000 units per month. Newman-Elaine Inc. has received an offer from an overseas customer for 500 bicycles at $125 per unit. Compute the total differential income from accepting the special order.