Tom Sullivan's charge account statement shows an unpaid balance of $1,392.08. The periodic rate is 2.5% of the unpaid balance. If he also has new purchases of $152.87, what is his new balance?

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%)