During one week the workman X manufactured 200 articles. He receives wages for a guaranteed 44 hours week at the rate of Rs.15 per hour. The estimated time to produce one article is 15 minutes and under incentive scheme the time allowed is increased by 20%. Calculate his gross wages under each of the following methods of remuneration.
[a] Time rate
[b] Piece rate with a guaranteed weekly wage
[c] Rowan premium bonus
[d] Halsey premium bonus, 50% to workman.