Q2) 1.6262... (а) 161/99
(b) 162/99
(c) 162/100
(d) 62/100

which is the correct one? PLEASE HELP​

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%)