A daily wage worker was paid Rs. 1990 during a period of 30 days. During this period, he was absent for 4 days and was fined Rs. 20 per day for absence. He was paid the full salary only for 20 days as he came late on the other days. Those who came late were given only half the salary for that day. What was the total salary paid per month to a worker who came on time every day and was never absent?