Somehow related to HP Calculators

[Albert Chan]

We can "move" paid raise of odd years to even. Here is a table for year 2k:

Code:

k    Δ       Δ²      Δ³
1    1000
2    2000    1000
3    3000    1000    0

cumulative paid raise (year 2n) = sum(1000*k, k=1..n) = 500*n*(n+1)

For year 6, cumulative paid raise = 500*3*4 = 6000

For completeness, for odd years:

cumulative paid raise (year 2n-1) = 500*n*(n+1) - 500*n = 500*n^2