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