Renting or leasing a customers mower

[Spudsey]

We have been asked to mow this fall for our local business while there employee is out, it takes him 20 hours per week to mow and trim (there is alot of trimming at this location). The have a John Deere front mounted 72 inch mower. The reason for thinking about using there equipment as well as ours as we can get it done more timely and I do not need to buy another mower for the short term. The are willing to let us use it. I am working on a quote to do the job an need to figure a per hour rate to reimburse them for the mower. Any suggestions?

Thanks.