Eng : Provider can making a discount for monthly payment when they can't solve the technical problem in case of down time is over 3 Hr. only. So they will calculate monthly
Example : Monthly pay = 4,500 Down Times change to minute (Over 3 Hr only) = 500 Minute
(4,500 * 500) / (30*24*60) = 2,250,000 / 43,200 = 52.08 Bath
Discount = 52.08 Baht for that month