Ruth runs her own hot dog stand on the U of A campus. The monthly cost of the cart rental and business permit is $1,000 Ruth's contribution margin per unit is $1.00, and her contribution margin ratio is 50% 1. How many hot dogs does Ruth need to sell each month to earn a target profit of $900 a month? 2. How much sales revenue does Ruth need to generate each month to earn a target profit of $900 per month? 1. How many hot dogs does Ruth need to sell each month to earn a target profit of $900 a month? First identify the formula, then compute the number of hot dogs Ruth will need to sell each month to earn a monthly target profit of $900. Sales in units