A company's product results for the month are as follows: Ans Actual Sales units 9,500 Budget 9,000 Mark Fla $ $ Sales revenue 104,500 108,000 Manufacturing costs at standard 76,000 72,000 Contribution 28,500 36,000 What was the sales volume contribution variance? a. $1,500 favourable Ob. $2,000 favourable Oc. $6,000 favourable Od. $7,500 adverse