Everyday Math


Percentage Change


When you freeze a full bottle of water, the bottle will become swollen. This is because water expands its volume by approximately 10%10\% when frozen. If you freeze 25 L25\text{ L} of liquid water, what will be its frozen volume in liters?

A survey showed that the total population growth in Las Vegas since 2010 has been 13%13\text{\%} per year. If the population of Las Vegas in 2010 was 2 million, how many more people lived in Las Vegas in at the start of 2011 than at the start of 2010?

Your height a year ago was 140 cm140\text{ cm} and your height today is 161 cm.161\text{ cm}. If your weight has shown exactly the same percentage growth as your height, and your weight one year ago was 60 kg,60\text{ kg}, how much weight, in kg, have you gained?

You answered 1414 questions correctly on a 2020-question test last month. Today, you answered 1717 questions correctly on another 2020-question test. This means you scored %\clubsuit\text{\%} last month and %\spadesuit\text{\%} today, showing a remarkable improvement. What is the improvement (in percentage) ?\spadesuit-\clubsuit?

John is looking for a new job that pays a higher salary than his current job which pays $2000\$2000 a month. If Wal-Mart offers a monthly salary of $2500\$2500 and John takes the job with Wal-Mart, what is the percentage increase in his salary?


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