The price of gas is 85.9 cents per litre. if brenda needs 48.3l of gas to fill her gas tank, how much will she pay?

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%)