Final answer:
Percentage is the suitable tool to compare composite parts of a whole.
Step-by-step explanation:
The suitable tool to compare composite parts of a whole is Percentage. Percentage is a way to express a fraction or a ratio as a portion of 100. It allows us to easily compare the size or proportion of different parts with respect to the whole. For example, if we have a pizza with 8 slices and we eat 4 slices, we can say we have eaten 50% of the pizza.