A 150 cm length of string is tied around a book measuring 30 cm x 20 cm x 2 cm asshown in the diagram. After knotting and tying a bow, 24 cm of string was left over. A second piece of string, also 150 cm long, is used to tie up a parcel of several copies ofthe book stacked back cover to front cover. A bow similar to that on the first parcel is tiedand then no string is left over. How many copies of the book are there in the second parcel?