Calculate Tasks Costs

I am testing on
I have a task billed at $100 for 10 minutes.
The cost on the invoice is $17
How is this calculated?
My math is 10 min of 60 min is 1/6 and the cost should be 16.67.
Thanks for the clarification,

It’s caused by rounding, task line items are rounded to two digit precision so 10 minutes is converted to 0.17 hours.