C. W. McCall selis a goldplated souvenir mug: McCall expects to sell 2,100 units for $35 each to earn a $15 contribution margin per unit. Janice McCall, president, expects the year's total market to be 30,000 units. For the year just completed, the local college won the national hockey championship, and as a result, the total actual market was 125,000 units. C. W. McCall sold 6,250 units and calculates sales variances using contribution margin What is the firm's sales volume variance? Salos volumo variance