The rental is calculated from the number of calendar days during the rental period. If you rent a machine for 1 month and 1 week (If rate is $6,000/ month) you pay $6,000/month plus $1,380, because we take 7 days divided by 30 days which equals .23 of a month X $6,000 + $1,380. Your total would be $6,000 + $1,380 = $7,380.
These are charged at 1/8,1/40, or 1/176 of the rental rate for the period. For example, if you put 195 hours on a machine in June and 170 hours on the same machine in July you have used it for 365 hours when only 352 hours were allowed. We take the rental period rate of $6,000 and divide it by 176 hours = $34.09 and times this by the 13 overtime hours which is $443.17.