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GMAT Data Sufficiency (DS) | Re: The cost of a certain phone call was $0.75 for the first 3

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Bunuel wrote:

megafan wrote:
The cost of a certain phone call was $0.75 for the first 3 minutes and $0.20 for each additional minute after the first 3 minutes. Did the phone call last longer than 15 minutes

(1) The cost of the phone call was less than $4.16
(2) The cost of the phone call was greater than$3.35



While this is a seemingly simple min/max problem, I was wondering if there is a faster way to deal with decimals—as it took me ~4mins to arrive at the solution.

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