he would need to rent it for a year or 12 months
The sum of the geometric series is 195
I’m pretty sure it’s C. because half of 12 is 6 so if they’re buying a pound and a half it would be 12+6, which is 18
I believe that the answer is 1845
the surface area of the cube is 1350
the surface area of the pyramid is 495
the total surface area is :

good luck
Multiplying the answer by one of the numbers and the other number should be answer