Final answer:
The signal words in the sentence are 'difficult' and 'easier'. These words indicate the contrast between calculating everything and having it listed on the product.
Step-by-step explanation:
The signal words in the sentence are 'difficult' and 'easier'. These words indicate the contrast between the difficulty levels of calculating everything and having it listed on the product. 'Difficult' suggests that calculating everything is challenging, while 'easier' implies that having it listed on the product makes it simpler. These signal words help the reader identify the solution to the problem, which is having the information listed on the product.
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