10.02 Wages

If the normal rate is $\$13.40$$13.40 per hour:

A call centre worker is paid $\$20$$20 per hour for a normal $37$37-hour week, and time-and-a-half for each hour worked thereafter. Calculate his income for a week in which he works:

For each week, Christa earns a wage of $\$18$$18 per hour for the first $23$23 hours, time-and-a-half for the next $9$9 hours, and double time after that. Calculate her weekly income if she works: