Refer to the following distribution of commissions. Monthly Commissions Class Frequencies $600 up to $800 3 800 up to 1,000 7. 1,000 up to 1,200 11 1,200 up to 1,400 12 1,400 up to 1,600 40 1,600 up to 1,800 24 1,800 up to 2,000 9. 2,000 up to 2,200 4. What is the class interval? O 200 O 300 O 3,500 O 400