Exercise 2 - solution

500 ml pot:
American 55 g/L: 0.5 x 55 = 27.5 g
Norwegian 63 g/L: 0.5 x 63 = 31.5 g

750 g water at 16:1: 750 / 16 = 46.9 g coffee

Yield for 28 g dose making 420 g at 1.45 percent strength:
1.45 x 420 / 28 = 21.75 percent

This is just inside the ideal 18-22 percent range (20 +/- 2 percent), toward the high end. (Formula from the chapter's script; the formula itself is marked check.)