Question 3 of 8 Time remaining: 89:24) 90 minutes left QUESTION 3.) Jewelry shop 's revenue is 250000 /year and contribution margin percentage is 20 percent. If the revenue raises to 300000 and the cost structure remains the same, which of the following is correct? a) contribution margin is 50000 , b) contribution margin is 60000 , c) contribution margin in percentages is 30 % d) none of the choices is correct contribution margin is 50000 contribution margin is 60000 contribution margin in percentages is 30% one of the choices is correct