According to the given data we have the following:
Mary earning per hour=$6.75
works 24 hours a week.
If he works 24 hours a week, then in order to calculate her straight time pay for a week we would have to use the following formula:
straight time pay for a week=hourly rate*hours worked
straight time pay for a week=$6.75*24 hours
straight time pay for a week=$162
Her straight time pay for a week is $162.