A brand of ceral had 1.2 miligrams of iron per serving. then they changed therlir recipe so they had 1.8 mg of iron per serving. What was the percent increase of iron?

The percentage of the increase of iron is 50% because it increased by 0.6 and that's 50% of 1.2mg

You not be doing this in a quiz. if you actually studied your work you would know the answer. the answer though is that they would use gdp per capita because it measures a smaller portion (person). this could show individual growth per person in the country.