Or see it this way: today was a 4c gain. If it goes parabolic (say doubling of daily gains each day), then tomorrow we could see +8c: 1.75. Friday: +16c --> 1.91. Monday : +32c --> 2.23. Tuesday: +64c --> 2.87. Wednesday: $1.28 --> 4.15.
If the promo runs to next Friday it could go all the way to almost $10... This is pure speculation, but just to show how fast a parabolic doubling goes. I am probably out before we hit that though!