Final answer:
Rosa saves 30% of her earnings.
Step-by-step explanation:
Amount earned per week tutoring = $120
Amount paid from paycheck = $36
To find the percent of Rosa's earnings that she saves, we need to divide the amount she saves by her total earnings and then multiply by 100.
Rosa earns $120 per week and saves $36 from her paycheck.
Thus, calculating the amount saved -
= 36/120
= 0.3 or 30% of her earnings each week.
Therefore, she saves 30% of her earnings.