Math patterns 2

Christa works in a yogurt stand. Each cup of yogurt sells for $\$5$. Instead of getting a fixed salary, Christa keeps $\$1$ from each cup sold and puts the rest in the register. At the beginning of the day, the register had $\$15$ in it. **Fill in the table to show how much money was in the register after each cup Christa sold.** Cups | Money $\left(\$\right)$ :-: | :-: $0$ |$\$15$ $1$ | $\$$ [[☃ math-keypad 1]] $2$ | $\$$ [[☃ math-keypad 2]] $3$ | $\$$ [[☃ math-keypad 3]] $4$ | $\$$ [[☃ math-keypad 4]] $5$ | $\$$ [[☃ math-keypad 5]]