
import numpy as np

# Given parameters
y0_K = 0.25
r = 0.71
t = 2
K = 80.5  # in millions, since the result should be 46.7 * 10^6 kg

# Calculation
y2 = K * y0_K / (y0_K + (1 - y0_K) * np.exp(-r * t))

print(y2)

