It has been estimated that there are 107 billion pieces of mail per year. If the postage rates are raised 5¢, how much extra revenue does that generate? (Enter your answer in fixed-point notation.)

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?