Correct:
HAT
Using 3¾ mm needles cast on 85 sts.
1st rib row (rs) P1, (k1, p1) to end.
2nd rib row K1, (p1, k1) to end.
These 2 rows form the rib.
Work a further 7 rows.
Inc row Rib 4, (m1, rib 5, m1, rib 7) 6 times, m1, rib 5,
m1, rib 4. 99 sts.
Using 3¾ mm needles cast on 85 sts.
1st rib row (rs) P1, (k1, p1) to end.
2nd rib row K1, (p1, k1) to end.
These 2 rows form the rib.
Work a further 7 rows.
Inc row Rib 4, (m1, rib 5, m1, rib 7) 6 times, m1, rib 5,
m1, rib 4. 99 sts.