Davis Division uses two raw materials 33 and Z42-to produce its product called Base 23 , a chemical base for interior house paint. The materials are mixed in the following standard proportions to yield 100 litres of Base 23 : It requires 5 hours of direct labour at $15 per hour to produce 100 litres of Base 23. On average, the division can produce and sell 20,000 litres of Base 23 per month. In a recent month, the division used the following amounts of materials and labour to produce 18,000 litres of Base 23 : Required: 1. Calculate the following materials variances for Base 23: (Do not round intermediate computations. Round final computations to nearest whole dollar. Indicate the effect of each variance by selecting "F" for favourable, "U" for unfavourable, and "None" for no effect (i.e., zero variance).)