Answer asap need i promise i will give brainlest but i'll have to be after two people answer the question but i'll get the first person the answer it brainlest

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%)