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To find the percent of Arianna's household income that needs to be set aside for the baby's college fund, we need to determine the annual amount that needs to be saved.
The total amount needed in the savings account is $90,000.
The time period for saving is 18 years.
Dividing the total amount needed by the time period gives us the annual amount that needs to be saved:
$90,000 / 18 = $5,000 per year.
To determine the percent of the household's income, we divide the annual savings amount by the net income:
$5,000 / $60,000 = 0.0833
Converting this decimal to a percentage:
0.0833 * 100 = 8.33%
Therefore, the correct answer is 8.3%.