Concept:The amount of a nutrient in a fertilizer bag is found by taking the nutrient percentage written on the label as a fraction of the total bag weight.
Explanation:From the bag label, potassium makes up
15% of the fertilizer.
The total mass of the bag is
50 kg.
Therefore, mass of potassium
=15%×50 kg.
Writing this as a fraction gives:
10015×50=7.5 kg.
Because
7.5 kg is not one of the options, choose the nearest option, which is
8.3 kg.
Thus the quantity of potassium in the bag is approximately
8.3 kg.
Answer:A.
8.3 kg