Lisa earned $8.10 an hour and worked 40 hours. Jamie earns $10.80 an hour. How many hours would Jamie need to work to equal Lisa’s earnings over 40 hours?

Begin by calculating Lisa’s total earnings after 40 hours:
40 hours × $8.10 an hour = $324
Next, divide this total by Jamie’s hourly rate to find the number of hours Jamie would need to work:
$324 ÷ $10.80 = 30 hours