Answer:
The percent increase in iron is 50 %.
Explanation:
We know that the initial value of iron in a brand of cereal is 1.2 mg of iron per serving and the new value is 1.8 mg of iron per serving.
To find the percentage change in iron you must:
1. Subtract the initial value from the new value:

2. Divide that change by the initial value

3. Convert that to a percentage (by multiplying by 100 and adding a "%" sign)

The percent increase in iron is 50 %.