What is the difference between determining the break$-$even point in units and determining the required sales in units for a target net income?To determine the break$-$even point in units you only need to know the unit contribution margin and the fixed costs, whereas to determine the required sales in units for a target net income you also need to know the variable costs.To determine the break$-$even point in units you need to know the variable costs and the fixed costs, whereas to determine the required sales in units for a target net income you need to know the target net income and the contribution margin ratio.To determine the break$-$even point in units you need to know the unit contribution margin and the target net income, whereas to determine the required sales in units for a target net income you need to know the fixed costs and the variable costs.To determine the break$-$even point in units you only need to know the unit contribution margin and the fixed costs, whereas to determine the required sales in units for a target net income you also need to know the target net income.