Exercise 2 - solution

Levels (highest level whose temperature has been reached):
207 C -> New England (passed 205, not 210)
222 C -> City (passed 219, not 225)
235 C -> Vienna (passed 230, not 240)

Extra line:
print(f"400 g roasted needs about {400 / 0.85:.0f} to {400 / 0.82:.0f} g green")

Output:
400 g roasted needs about 471 to 488 g green

(15 percent loss leaves 85 percent, so 400 / 0.85 = 470.6; 18 percent loss leaves 82 percent, so 400 / 0.82 = 487.8.)