joseph., manufactures a product 'X'. It is estimated that for each ton of materials consumed, 100 articles should be produced. The standard price per ton on materials is $. 10. During the first week of January 1993, 100 tons of materials were issued the factory for production. It was priced at $. 10.50 per ton Production during the week was 10,200 articles. Compute the different material variances from above