We look at how a stack can change in time by adding a constant number or a constant percentage.
Or by adding a variable predictable number.
Q: How to predict the terminal number when the change is constant?
A: By using constant change-equations:
If Ko = 30 and ΔK/n = a = 2, then K7 = Ko+a*n = 30+2*7 = 44
If Ko = 30 and ΔK/K = r = 2%, then K7 = Ko*(1+r)^n = 30*1.02^7 = 34.46
Q: How to predict the terminal number when the change is variable, but predictable?
A: By solving a variable change-equation:
If Ko = 30 and dK/dx = K’, then ΔK = K-Ko = ∫K’dx