Delta = 1000;
Points_______Units
0___________1
1000________2 [0+1*Delta = 1000]
3000________3 [1000+2*Delta = 3000]
6000________4 [3000+3*Delta = 6000]
10000_______5 [6000+4*Delta = 10000]
15000_______6 [10000+5*Delta = 15000]
21000_______7 [15000+6*Delta = 21000]
28000_______8 [21000+7*Delta = 28000]

f(n) = Delta*[(n-1)+(n-2)+...+(n-n)]
where n = number of units, and f(n) = the minimum points to achieve the
number of units.

Does anyone know what function in excel to determine the number of units
based on certain point levels? such as if the points are 25600 in Cell A1,
then the number of units will be 7 in Cell B1?
Thank you for any suggestion
Eric