How Much are All The Champions Worth? (as of patch 7.8)

The IP cost as of patch 7.8 is 530.550 for all champions, once Xayah and Rakan become 6300 IP, but until then they are 533,550 while they are 7800 IP

Now in RP it is fairly different because of champion RP sales but for simplicity, I will leave it out is 104,265, so... a lot lower.

But how much does this really cost in real dollars? I calculated that on the high end (the amount you get for 5$) is $802.04 and on the low end (the amount you get for $100) is $695.10 but since you can only buy RP in certain amounts it would be $700 for every champ in the game with RP.