Final answer:
To calculate the percentage of Sandra's income that goes toward her mortgage, divide her annual mortgage cost by her annual income and multiply by 100, resulting in 20% of her income being allocated to her mortgage payments.
Step-by-step explanation:
To determine what percent of Sandra's income pays for her mortgage, first calculate her annual income by multiplying her monthly income by the number of months in a year:
$10,000 \times 12 = $120,000
Next, divide the annual mortgage amount by the annual income and multiply by 100 to get the percentage:
($24,000 / $120,000) \times 100 = 20%
Therefore, 20% of Sandra's income pays for her mortgage.