Ruth Lockwood earns $2,917 a month as a supervisor for Acme steel. Her group medical coverage cost 3,120 per year. The company pays 75 percent of the paycheck for medical insurance

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%)