$28 represents 35% of her earnings.
To find the total earnings of Julia, we need to find 100% of her earnings.
Step 1. Find how much is 1% of her earnings by dividing $28 by 35%:
$0.8 is 1% of her earnings.
Step 2. Multiply the result from step 1 by 100 to find 100% of her earning:
Julia earns $80 from babysitting.
Answer: $80