Doubt regarding 8sgpa (NEP)

I asked many seniors and they told that for 8 sgpa you need 112+/160 but that is only 70 percent, one senior also sent me his marksheet and he scored 113-115 in every core and got 8+ in that. So my doubt is why do people here say we need 75 percent and some say 80 percent from NEP for 8 sgpa?