Answer :
[tex]You\ must\ divide\ \$1,089.72\ by\ \$18\\\\1,089.72:18=60.54\\\\rounded\ to\ the\ nearest\ whole\ number:\ 60.54\approx61\\\\Answer:\boxed{61\ haircut}[/tex]
Divide 1,089.72 by 18 and then round it up to the nearest whole number