The decimals are normally rounded off. Some things like protection runes and summon scrolls I didnt get in my 60 keys. Very hard to get best discount percentages esp for masked man. based on my opinion, The best things to get here is advanced refine for sure at 40%, even 30% would be good esp if you dont have much luck with sage world. Purification and protection runes have good prices but buy them in later phases of your game after focusing on other power sources since purification is highly RNG based. Never buy the advanced, medium or common cloth( you get them easily from SA). Better to buy Delux charms pack which gives charms at 80 per pack but you would need to save up 4000 coupons(there is a treasure key event where you get charms at 71 per pack, but it comes once in two -three months.. Dont buy medium refines, you get them from group shop and they appear in redeem option of llot of events. Better not buy the rare ninjas here. If you really want, you can go for GNW tenten if you get at 30% discount esp if you have mei. You can get iruka in earlier stages of game if you dont want to wait out to piece out hiim in fragment refining. Anbu clothing seems too expensive. It was around 3800 coupons in lucky board along with all the goodies you get in board. Legendary ninja pack is only if you want to rush getting those red tools, or you can wait and get them from TI.