please solve asap,

Q4: The standard labour cost per unit of Product X is: Grade 1 - 5 hours Rs.5 Grade 11 - 8 hours Rs.4 Grade Ill - 10 hours Rs.4 For 500 units of production, following payments were made: Grade 1 - 2,400 hours Rs.2,640 Grade II - 6,000 hours Rs.2700 (1,000 idle hours) Grade III - 7,000 hours Rs.2,940 (500 idle hours) Calculate labour variances