Ranking Cost

This would be the minimal required counts/gold to fulfill the 100 training point requirement assuming

• you only require 1 charge per kill
• you criticial 100% of the time(much lower percent needed for most ranks)
• a monster never goes into deadly
• you are NOT receiving any skill training bonuses(pots, destiny, double rainbow)

rN 10,000 (100 attacks)
rF 5,500 (55 attacks)
rE 8,000 (80 attacks)
rD 10,000 (100 attacks)
rC 11,700 (117 attacks)
rB 17,600 (176 attacks)
rA 20,000 (200 attacks)
r9 21,300 (213 attacks)
r8 16,300 (163 Attacks)
r7 21,000 (210 Attacks)
r6 36,000 (360 Attacks)
r5 45,000 (450 Attacks)
r4 60,000 (600 Attacks)
r3 70,000 (700 Attacks)
r2 70,000 (700 Attacks)
Grand Total: 422,400 gold

Someone might wanna double check my math it's easy to get confused when working with so many numbers…