Daria sells televisions. She earns a fixed amount for each television and an additional $25 if the buyer gets an extended warranty. If Daria sells 18 televisions with extended warranties, she earns $1,350. How much is the fixed amount Daria earns for each television?

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%)