Overhead Variances Sona Corporation's budget is based of an expected 150,000 units of output with a fixed cost of $500,000 and variable cost of $305,000. Each unit requires 25 minutes of direct labour. During the year, 135,000 units were produced, requiring 78,056 direct labour hours with an actual total overhead cost of $548,000. Total overhead includes $268,000 of fixed costs. Required: 1. Compute the standard overhead cost per unit of product and per hour (variable, fixed, and total) 2. Compute the standard overhead cost charged to Work-in-Process during the year 3. Analyze the total overhead variance, using the four-variance analysis method. Indicate whether the variance is favourable or unfavourable