Answer:

Step-by-step explanation:
Given



Required
Determine the percentage of protein
First, we need to calculate the total:



Percentage of protein is calculated as thus:




The unit rate is how many calories are in 1 cup of cereal.
Set up a proportion:

Cross multiply and solve:

There are 100 calories per cup of cereal.
To get the calories in 4 cups of cereal, simply multiply the unit rate of 100cals/cup by 4.

There are 400 calories in 4 cups of cereal.
You have to add 10 last.
divide 75÷8 and then add 10
Your answers we equal to 22