TIP: use k for thousand use m for million, b for billion, and t for trillion!
Robux cost:
Worth $ in DevEx
Gift cards cost: $
(gem value/20m)*4500=robux value
robux*0.0035-5(exchange fee) = devex (1r$ = $-4.9965)
(robux/800)*10= cost to buy enough gift cards to buy the gems