A fish tank in the shape of a right rectangular prism is 15 inches long, 7 inches wide, and 9 inches high. What is the total amount of water needed, to the nearest cubic inch, to fill 80% of the fish tank with water?

A 105 cubic inches

B 756 cubic inches

C 945 cubic inches

D 474 cubic inches

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%)