Final answer:
The box of cereal holds 625 grams after a 25% increase from its original mass of 500 grams.
Step-by-step explanation:
The question asks how many grams of cereal a box would contain after a 25% increase from its original mass of 500 grams. To calculate this, we need to find 25% of 500 grams and then add that number to the original mass.
First, calculate 25% of 500 grams:
25% of 500 g = 0.25 × 500 g = 125 g.
Next, add the increase to the original mass:
500 g + 125 g = 625 g.
Therefore, the box of cereal now holds 625 grams after the 25% increase.