To find the cost of eight stuffed animal sharks, we first need to determine the cost of one stuffed animal shark.
The cost for five stuffed animal sharks is $64.95. Therefore, the cost of one stuffed animal shark is:
\[ \text{Cost of one shark} = \frac{\text{Total cost for five sharks}}{\text{Number of sharks}} = \frac{64.95}{5} = 12.99 \]
Now, we can find the cost of eight stuffed animal sharks:
\[ \text{Cost for eight sharks} = \text{Cost of one shark} \times 8 = 12.99 \times 8 = 103.92 \]
Thus, the cost of eight stuffed animal sharks is $103.92.