standard costing

pls solve this

a company is producing a std mix by using 60 kg of material x and 40 kg of material y . the std loss of production is 30% .the std price of x is 5 per kg and that of y at 10 per kg .the actual mixture and yield were as follows .

x 80kg @ 4.50 per kg       y70kg @ 8 per kg

actual yield 115 kg

pls calculate material cost variances