We are told that Rayna made a $27.79 purchase. the change for $30.00 is the difference between the two quantities, that is:
[tex]30.00-27.79=2.21[/tex]Therefore, the change must be $2.21.
The change can be made using the following coins and bills:
[tex]\begin{gathered} 2\text{ one dollar bill} \\ 2\text{ ten cents coins (dimes)} \\ 1\text{ one cent coin (penny)} \end{gathered}[/tex]