Abrand of cereal had 1.2 milligrams of iron per serving. then they changed their recipe so they had 1.8mg of iron per serving. what was the percent increase in iron?

To get the percent of increase, we will simply follow these steps:
1- get the difference between the two numbers:
difference = 1.8 - 1.2 = 0.6 mg

2- divide the difference by the original number and then multiply the quotient by 100 to get the percentage
% of increase = (0.6/1.2) * 100 = 50%