Consider each situation independently: a. What is the gross margin if sales are $130,000 and cost of goods sold is $85,000 ? b. If gross margin is $20,000 and cost of goods sold is $50,000, what was sales revenue? c. If sales are $44,500 and gross margin is $11,500, what was cost of goods sold? a. What is the gross margin if sales are $130,000 and cost of goods sold is $85,000 ? b. If gross margin is $20,000 and cost of goods sold is $50,000, what was sales revenue? c. If sales are $44,500 and gross margin is $11,500, what was cost of goods sold