Ng Corporation produces and sells only one product; its selling price is $100 and its variable cost is $80 per unit. The company's monthly fuced expense is $20,000. Required: 1. Using the equation method, determine the unit sales that are required to earn a target profit before tax of $3.000. Unit Sales 2. Using the formula method, determine for the dollar sales that are required to earn a target profit before tax of $4,000, Dollar sales 3. Using the formule method. calculate the number of units that need to be sold to earn an attentax income of $6.000. assuming star test2