Hi Jean Marie,
If you look at the increases each row is increasing 6 stitches.
Row 8: ended with 48 sc.
Row9: is increasing by 6 like the rest of the rows 48 plus 6= 54
Row 9 : 4sc, (inc, sc) 3 times, 18sc, (inc, sc) 3 times, 14sc - 54

Spoula