The negativity growth rate per capita make some sense, since the population rise to 1% while the GDP only rise by .83%. So that we get a negative number.
So the new zombie's rate of economic growth is equal to -53.33% ((1680 - 3600) /3600) * 100
G = x Felicia is Gabriella's age + 6 F = x + 6 Their mother is twice Felicia's age M = 2(x + 6) or 2x + 12 Tanya is the age of their mother plus Gabriella's age A = 2x + 12 + x = 3x + 12 3x + 12