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Good formula for converting robux however most people would know this.
Anyway, good job.
The buy robux ( not R$ cough) price is inconsistant, changes depending on user, device, and location; and even within the same user, device, and location is inconsistant (with higher robux amounts having a lower relative cost compared to lower robux amounts).
The DevEx rate of 0.0035 is the only official and consistant rate for the value of Robux.