So charged in stone extraction drilling work is increasing at a rate of per day, 40000 baht/day is 17 days, which amount is baht Bill 680000 with additional reductions later.
Therefore charged the cost of the drill rigs is increasing at the rate of Baht 40,000 / day for 17 days, totaling 680,000 baht will be collected along with additional cuts later.
Can charge the cost in drilling to extract stone is added in a day rate, 40 000 baht per day were 17 day including a money, 680 000 baht. Which will be charged with the work increased, decreased later.