The nutrition facts panel on a box of crackers indicates that one serving provides 140 calories, with 55 calories coming from fat. calculate the percentage of calories from fat in this product select one:
a. 85%
b. need more information to calculate.
c. 39%
d. 55%

c. 39%

Explanation:

We know that one serving of crackers provides 140 calories, with 55 calories coming from fat.

In order to find the percentage of calories from fat in the crackers we need to know what percentage of 140 calories are 55 calories.

We can say that exist a linear relationship between the percentage and the amount of calories. We can also say that this relationship is a direct linear relationship. This means that for a greater amount of calories the percentage will be higher. We can write :

Where the number 100 in the denominator is 100% ⇒

Solving for x :

x = 39.2857% ≅ 39%

x = 39%  

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