help. what would be the answer & how do you solve it?

Veronica runs her own hot dog stand on the U of A campus. The monthly cost of the cart rental and business permit is $500. Veronica's contribution margin per unit is $1.00 and contribution margin ratio is 50%. 1. How many hot dogs does Veronica need to sell each month to earn a target profit of$900 a month? 2. How much sales revenue does Veronica need to generate each month to earn a target profit of S900 a month? 1. How many hot dogs does Veronica 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 Veronica will need to sell each month to earn a monthly target profit of $900. 2. How much sales revenue does Veronica need to generate each month to earn a target profit of $900 a month? Enter the formula, then compute the sales dollars needed to earn a target profit of $900 per month