Iceberg lettuce is grown and shipped to stores for about 30 cents a head, and consumers purchase it for about 72 cents a head. find the percent increase.

In this question, you divide the number it has increased, by original amount and times it by 100 to get the percent.

In this case, 72-30 = 42
42/30 = 7/5 
7/5 x 100 = 140%

I hope this makes sense!