Question

Katherine spends $1,089.72

Answer 1

$You\ must\ divide\ \ 1,089.72\ by\ \ 18\\\\1,089.72:18=60.54\\\\rounded\ to\ the\ nearest\ whole\ number:\ 60.54\approx61\\\\Answer:\boxed{61\ haircut}$

Answer 2

Divide 1,089.72 by 18 and then round it up to the nearest whole number