here is my question and I have the answer but I did not understand it (each question with the answer) so can you please explain to me Average

here is my question and I have the answer but I did not understand it (each question with the answer)

so can you please explain to me 

Average inpatient stay chart contains 100 pages per AHIMA•One hundred sheets of standard weight paper measures _ inch thick, plus 1/8 inch for manila folder•5/8 inch needed for each paper chart

Shelving unit for medical records that is 36 inches wide will have 34 inches of filing space per shelf•Standard shelf depth 12 inches; shelving units usually have 6, 7, or 8 shelves spaced 10 inches apart

Therefore, based on this example, 36-inch-wide unit with 7 shelves can store 378 patient charts approximately–200 units needed to store paper records for 75,000 patients

•1 inch of charts weighs approximately 2.5 pounds•For 34-inch shelves times 7 shelves, weight is 590 pounds•Shelving unit with lockable doors weighs 210 pounds

•Total weight of each filled unit is 800 pounds•Combined weight for 200 filled units is 80 tons

SO can you please explain the steps and the formal that using her