Find out the labour cost per hour to a worker who is paid $ 200 per month in addition to dearness allowance of $ 50 month. He is entitled to bonus at the rate of 10% on wages. Employer's contribution is 8 1/3% of wages towards contributory Provident Fund and 1% towards ESI Scheme. The employee's contribution towards ESI Scheme is 12%. The worker is entitled to leave with full pay for 1/20 of days worked. The employer maintains a canteen where subsidised tea and lunch are provided to workers and a monthly subsidy of $1,000 is provided to the canteen. The total number of employees who take advantage of this canteen is 200. Normal idle time amounts to 20%. The average working days in a month are 25 of 8 hours each