I will give 10 points A rectangular prism is completely packed with 200 cubes of edge length fraction 1 over 5 inch, without any gap or overlap. Which of these best describes the volume of this rectangular prism?
a. 1 unit cube and 15 smaller cubes of volume fraction 1 over 125 cubic inch each
b. 1 unit cube and 75 smaller cubes of volume fraction 1 over 125 cubic inch each
c. 7 unit cubes and 25 smaller cubes of volume fraction 1 over 125 cubic inch each
with explanation on how you got that answer