Suppose you deposit $2,000 in a savings account that pays interest atan annual rate of 4%. if no money is added or withdrawn, determine how many years it will take for the account to contain $2,500

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%)