Hi there!
The tax on the spaceship is 8% of 15.99
The word "of" is the same thing as a multiplication sign.
8% of 15.99 = 8% × 15.99
8% = 0.08
8% × 15.99 = 0.08 × 15.99
0.08 × 15.99 = 1.2792
15.99 + 1.2792 = 17.2692
Your answer is: The final price including tax for the spaceship is about $17.27
There you go! I really hope this helped, if there's anything just let me know! :)