please help, will up vote. the correct answer is $8.93 per minute, i just don't know how to solve it

The constraint at Rauchwerger Corporation is time ort a particular machine. The company makes three products that use this machine. Data concerning those products appear below: Assume that sufficient time is available on the constrained machine to satisfy demand for all but the least profitable product. Up to how much should the company be willing to pay to acquire more of the constrained resource? (Round your intermediate calculations to 2 decimal places.)