Answer:
1. 550 units of hot dogs
2. $2200
Step-by-step explanation:
1. Computation of Number of hot dogs need to sell each month to earn a target profit of $900 is shown below:-
Monthly fixed cost = $200 (Cart rental and business permit) 
Sale price per unit = Contribution margin per unit ÷ Contribution margin ratio
= $2 ÷ 50% 
= $4 
Variable cost per unit = $2 × (4 × 50%)
Number of units to be sold = Fixed cost + Target profit ÷ Contribution margin 
= $200 + $900 ÷ 2 
= 550 units of hot dogs
2. Calculation of sales revenue to earn a target profit of $900 : 
Break even sales revenue = Fixed cost ÷ Contribution margin ratio 
= $200 ÷ 50% 
= $400
Sales revenue to be generated = Fixed cost + Target profit ÷ Contribution margin ratio 
= $200 + $900 ÷ 50% 
= $2,200