Astrology vimshottari dasha explanation by 10 year old Abhigya

Abhigya explaining the number of years allotted to each planet in vimshottari dasha according to Brihat Parashara Hora Shastra. Dr.G.S.Kapoor's translation and commentary did not contain the explanation as to how these numbers were arrived at as per the Shloka. So Abhigya tried to decode the sanskrit shloka as per his own understanding. This shloka can be found in Chapter 46 verse 15.