To solve for s in the equation 25 * (540 - s) = 2500, we will first distribute the 25:

25 * 540 - 25s = 2500

Next, we will simplify:

13500 - 25s = 2500

Now, we will isolate the variable s by subtracting 13500 from both sides:

-25s = -11000

Finally, we will divide by -25 to solve for s:

s = 440

Therefore, the value of s in the equation is 440.