Riot gifting RP for small purchases?

I don't know the exact amount Riot gives but could I please get 80 RP? I'm that far away from the 2 Rune page bundle and I'm not really keen on spending 10$ for more RP I won't use :O almost I'm abit OCD and I just want 0 RP Finally lol

EDIT: just realized there is a bunch of 520 skins Im 10 RP off 520 So if gifting 10 RP is more justifiable than 80 RP that's fine, Tundra warwick skin looks sweet.