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Why not just tell the user the actual base charge, per mile, and per minute charge at all times before they confirm the request for the ride? If it is during a surge period, those rates would change (by the multiplier). Wouldn't that solve all of this and be easy for you to implement? I think folks just want to see $s and not coefficient factors.
Hope that solves your problem. Bstod from NYC strategy consulting
3 years ago on Surge Pricing Followup