In a manufacturing company, the daily wage rate guaranteed for a worker is Rs 25 and the standard output fixed for the month is 1,000 units, representing 100% efficiency. The daily wage rate is paid without bonus to those workers who meet up to 66.3% the set efficiency standard. Beyond this, there is a bonus payable in a graded scale in a fixed ratio to the increased output as under:

There is an increase of 1% for every 1% further rise in efficiency. Find the total earnings of A, B, C and D who have worked 26 days in a month. The workers’ outputs are A—500 units, B—900 units, C—1000 units and D—1,100 units.

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Efficiency Bonus payable 90% 100% 10% 20%