Isabella is going to an amusement park. The price of admission into the park is $20, and once she is inside the park, she will have to pay $2 for every ride she rides on. How much money would Isabella have to pay in total if she goes on 13 rides? How much would she have to pay if she goes on

20 rides?

If Isabella goes on 13 rides, she would have to pay an additional $2 for each ride, for a total of 13 * $2 = $<<13*2=26>>26.

Therefore, Isabella would have to pay a total of $20 + $26 = $<<20+26=46>>46 if she goes on 13 rides.

If she goes on 20 rides, she would have to pay an additional $2 for each ride, for a total of 20 * $2 = $<<20*2=40>>40.

Therefore, Isabella would have to pay a total of $20 + $40 = $<<20+40=60>>60 if she goes on 20 rides.