Analysis:

Fold once: thickness 2t, area 1/2t.

Twice folding: thickness 4t, area 1/4t.

Three folds: thickness 8t, area 1/8t.

40% off: thickness 16t, area116t.

50% off: thickness 32t, area 1/32t.

60% off: thickness 64t, area 1/64t.

30% off: thickness 128t, area1128t.

20% discount: thickness 256t, area 1/256t.

10% discount: thickness 5 12t, area 1/5 12t.

It can be seen that the thickness of newspaper increases with the increase of folding times, and its area also decreases. Coupled with the tension of the paper itself, it is more difficult to fold the newspaper in half nine times than to fold 5 12 newspapers at a time!