Missing 5 rp

Whats up riot? Today i decided i wanted Elise, Tahm and Ekko and unfortunately went to calculate it and found out that 20 dollars is 2800 RP + 120 RP (currency} which is 2920 RP and that can only buy 2, 975 champions. I am 5 RP short from Ekko meaning after i buy 2 975 riot point items i would be at 970 RP which is 5 rp away from any other item !!! !!! So i am wondering if you guys could be so nice and fund me 5 RP? Thank you, Jay