First let's calculate the cost for Imani.
The membership is $10, and each book costs $5. If Imani listened to 4 books, the cost is:
[tex]\begin{gathered} \text{Cost}=10+4\cdot5 \\ \text{Cost}=10+20 \\ \text{Cost}=30 \end{gathered}[/tex]
Now let's calculate the cost for Esteban.
The membership is $16, and each book costs $2. If Esteban listened to 4 books, the cost is:
[tex]\begin{gathered} \text{Cost}=16+4\cdot2 \\ \text{Cost}=16+8 \\ \text{Cost}=24 \end{gathered}[/tex]
So Imani's cost is higher.
