C# Math Design Logic 2

Question

I am trying to come up with a good design of the logic below

Review the example below. I am evaluating the equation below from 10.00 to 15.00 in increments .01 or 10 nano meters. 10.00, 10.01, 10.02 ........... 15.00



Find Y values from a of range 10.00 to 15.00 nano meters. I am asking how to produce the logic. There will be over two hundred values. The limit is from 10.00 to 15.00

Y = X + 3


I am trying yo pruduce the Y output limit is from 10.00 to 15.00 by 10 nanometers or.01
Example:  Y is my output. 

  X  |  Y
  -----------------
  10.00  | 10.03
  10.01  | 10.04
  10.02  | 10.05
  10.03  | 10.06
  15.00  | 15.03