One year, the population of a city was 397,000. Several years later it was 412,880. Find the percent increase.

Horace's speedometer reads 60 miles per hour, but during a road test he finds that he was actually driving 58 mph. what is the percent error in horaces speedometer?

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?