A worker under Halsey method of remuneration has a day rate of rs.12 per week of 48 hours,plus a cost of living bonus of 10paisa per hour worked. He is given 8hours task to perform, which he accomplishes in 6 hours. He is allowed to 30% of the time saved as premium bonus. What would be his total hourly rate earning and what difference would it make if he paid under rowan method.