What will be the earnings of a worker at Rs 5.50 per hour when he takes 140 hours to do a volume of work for which the standard time allowed is 200 hours? The plan of bonus is on sliding scale as under:

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Bonus within the first 10% of saving in standard time Bonus within the second 10% of saving in standard time Bonus within the third 40% of saving in standard time Bonus within the fourth 10% of saving in standard time Bonus for the rest 40% of time saved 50% of time saved 50% of time saved 70% of time saved 75% of the time saved