4.5 Exercise – Changes in percent 
1.
Write the new value: 




2.
Write the percentual change: 




3. A mobile telephone from 1996 weighed 200 g. A year later a new model weight 85 g. Write a mathematical expression and calculate the proportion of decrease in weight. 




4. In 2002, gasoline cost 8.4 kr /l. Today it costs 10.8 kr/l. Write the mathematical expression and calculate the proportion of increase in price. Round your answer to tenths. 




5. A two year old child is on average 86 cm tall. A three year old is on average 92 cm. Write a mathematical expression and calculate the proportional increase. Round your answer to a whole number in percent. 




6. A store decreased the price of a camera from 900 kr to 783. Write a mathematical expression and calculate the rate of change. Round your answer to three decimals. 




7. After a rain storm, the mass of a water holder increased from 10.4 kg to 13.6. Write a mathematical expression and calculate the rate of change. Round your answer to three decimals. 




8. You deposit 30,000 kr into a savings account with a yearly interest rate of 6 %. After 3 years, you have 35,730. Write a mathematical expression and calculate the rate of change. 


