Refer to the table below to answer the following question Table 1: Production Possibilities for Simon's simple factory Nuts (units per day) 0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 Bolts (units per day) 10,000 9,500 9,000 8,000 7,000 5,000 3,000 0 Calculate Simon's opportunity cost in units of nuts when he increases the production of bolts from 7,000 to 8,000 units per day Type your answer as a number in the box below. Type the number only.