Net sales P100,000 ?4 200,000 240,000 Beginning inventory 15,000 12,000 --- ?7 30,000
Net purchases 55,000 ?5 125,000 95,000
Goods available for sale ?1 ?6 145,000 ?10
Ending inventory 10,000 25,000 ?8 ?11
Cost of Goods sold ?2 40,000 ?9 ?12
Gross Profit ?3 90,000 85,000 130,000

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”?