Explain at least one reason why knowing the surface area or the volume of your rectangular prism important?

(If this helps my prism is L=6 W=2 H=2)
PLEASE HELP

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=