Williams Inc. produces fluorescent lightbulbs for commercial use. The accounting manager is attempting to estimate the total cost for the next quarter using the high-low method. He has compiled data...

Williams Inc. produces fluorescent lightbulbs for commercial use. The accounting manager is attempting to estimate the total cost for the next quarter using the high-low method. He has compiled data and found the high and low costs are $10,000 and $6,000, respectively, and the associated cost drivers are 7,000 and 3,000 packs, respectively. What is the value for b (the variable cost per unit)? What is the value for a (the fixed quantity)?