What is her true hourly wage?

Her true hourly wage is $30.
14 work days for her are 98 hours.
If she works 98 hours, she get $2744.
But for 14 work days, she got amount of money, she would get for working 15 days. 15 work days are 105. If she had worked 105 hours for wage $28, she would earn $2940. But she worked only 98 hours. That is why you need to divide $2940 by 98.
2940/98=30