Hi Peter

Let us walk through this as per what I suggested

(100V-10)*126 = 11340 = $2C4C
(150V-10)*126 = 17640 = $44E8

Now suppose we drop the last nibble( divide by 16), you get $24C and $44E which is pretty close to the numbers you're seeing. So, the error must be in the formula being an approximation.

Hope this makes it easier for you to solve the issue

Regards