Ng Corporation produces and sells only one product, its selling price is $80 and its variable cost is $60 per unit. The comp monthly fixed expense is $28,000. Required: 1. Using the equation method, determine the unit sales that are required to earn a target profit before tax of $5,000. Unit salesunits 2. Using the formula method, determine for the dollar sales that are required to earn a target profit before tax of $6,000 Dollar sales 3. Using the formula method, calculate the number of units that need to be sold to earn an after-tax income of $8,000, assun rate of 20%.