Final answer:
To represent 70% as a rate per 100, it is expressed as the fraction 70/100, which simplifies to 0.7. Option A) 0.7 is the correct answer.
Step-by-step explanation:
The question requires converting a percentage to a rate per 100 to determine how much almond flour Mrs. Garcia should use for her bread recipe. To write 70% as a rate per 100, you express 70% as a fraction with a denominator of 100. This can be represented as 70/100, which is simplified to 0.7 when used in calculations. Therefore, option A) 0.7 is the correct representation of 70% as a rate per 100.