A food manufacturer can claim on a label that a food is a "good source" in a nutrient if it has at least 10% of the recommended
daily amount of that nutrient.
The recommended daily amount for iron is 25 grams. What is
the minimum amount of iron that a serving of food must have
to claim on the label that it is a "good source of iron"?
grams

Greetings from Brasil...

25mg is recommended, but the minimum for the label would be 10% of 25mg. So just apply percentage (rule of 3)

  mg               %

  25   --------  100

   X    --------   10

100 · X = 25 · 10

100X = 250

X = 250/100

So, it is enough that the product has 2.5mg of iron to be labeled as a "Good Source of Iron"

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b