A kitten's weight increases by 12% each week for the first 4 months. The kitten currently weighs 2.6 pounds. Which expression will not calculate how much the kitten will weigh in 1 week?

1. 2.6(0.12)

2. 2.6(1.12)

3. 2.6 + 2.6(0.12)

4. 2.6 + 0.312