Prepare a vertical analysis for a scuba company that had net sales of ​$874800​, operating expenses of ​$207328​, and a cost of goods sold of ​$406782. The percent cost of goods sold is ?.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)