plz advice me how to solve dis ques.

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pratik mehta (Querist)
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16 March 2009 Standard hour for manufacturing two products M & N are 15hrs/unit & 20 hrs/unit respectively.Both products require identical kind of labour and standard wage rate per hour is Rs.5.In the year 2006, 10000 units or M & 15000 units of N were manufactured. The totals of labour hour actually worked were 450500 and actual wages bill cameto Rs.2300000.This include 12000 hours paid for @ rs.7/hrs and 9400 hours paid for rs.7.50/hrs, the balance had been paid at rs.5/hrs.Calculate labour rate variance,labour efficiency variance, labour cost variance.