So, lets think about the information we are given.
Sammy earns 23,400 in a given year.
In a year, he works 52 weeks.
Per week, he works 30 hours.
Find hours -> find pay.
To find hours, multiply number of weeks by hours
52 * 30 = 1560
He works 1560 hours per year.
To find hourly income, divide total money per year by hours per year. He makes 15 dollars per hour.
Find $ per week.
Hourly rate by hours per week
15 * 30 =450 per week
Hope this helps :)