What will be the earnings of a worker at Re 0.55 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 payment of hours is on a sliding scale as under

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Within the first 10% saving in standard time, bonus is 40% of the time saved. Within the second 10% saving in time, bonus is 50% of the time saved. Within the third 10% saving in standard time, bonus is 60% of the time saved. Within the fourth 10% saving in standard time, bonus is 70% of the time saved. For the rest, bonus is 75% of the time saved.