Step 1 :Given that there are 604 calories in 8 servings.
Step 2 :We are asked to find the rate of calories per serving. This can be calculated by dividing the total number of calories by the total number of servings. The units will be calories/serving.
Step 3 :So, we divide 604 calories by 8 servings to get the rate.
Step 4 :\(\frac{604 \text{ calories}}{8 \text{ servings}} = 75.5 \text{ calories/serving}\)
Step 5 :Final Answer: The rate written as a fraction in simplest form is \(\boxed{75.5 \text{ calories/serving}}\).