4. Refer to the original data. The Marketing Department thinks that a fancy new package for the laptop computer battery would help sales. The new package would increase packaging costs by $0.70 cents per unit. Assuming no other changes, how many units would have to be sold each month to earn a profit of $4,100? (Do not round your intermediate calculations. Round your final answer to nearest whole number.) ales (13,100 units $20 per unit) $ 262,000 Variable expenses 131,000 Contribution margin 131,000 Fixed expenses 146,000 Net operating loss $ (15,000)