Final answer:
Tim will save $28 per week by saving 10% of his weekly paycheck. After 12 weeks, he will have a total of $336 in his savings account.
Step-by-step explanation:
Tim earns $280 every week and wants to save 10% of his paycheck for 12 weeks. To calculate how much he will save each week, we multiply his weekly earnings by the percentage he wants to save:
$280 × 10% = $280 × 0.10 = $28 per week.
Next, to find the total amount saved over 12 weeks, we multiply the weekly savings by the number of weeks:
$28 × 12 = $336.
Therefore, after 12 weeks, Tim will have $336 in his savings account, which corresponds to option b.