In a manufacturing concern the daily wages guaranteed to workers is Rs.2. The standard output for the month is 1000 units representing 100% efficiency. The rate of wages is paid without bonus to those workers who show upto 66 2/3% efficiency. Beyond this, bonus is payable in a graded scale. 90% efficiency bonus 10%; 100% efficiency bonus 20%. Further increase of 1% bonus for every 1% further rise in efficiency. Calculate the earnings of A,B,C & D who have worked 26 days in a month and their output was 500, 900, 1000 and 1200 units respectively.