Here's an example to help explain. Let's say you're heads-up on the flop, you have a strong hand but there's a flush draw out there. The pot is $3, and your opponent leads out for $1. You have a note on him that he does this with draws, so you want to make a pot sized raise to price him out. Well, the existing pot is $3 + $1 = $4. So do you raise $4 to a total of $5? No! If you put in $5, your first dollar is your CALL, the next $4 is your RAISE. Your opponent would now have to call $4 into a $5 pot. Good enough to price out a draw, obviously, but not a complete pot-sized raise.
To raise the pot, you always first include the price of your call. So in the above example, your call would make the pot $5, then you raise $5 more on top of the $1 bet to make it $6 to go.
In the OP's original question, the pot is .10 + .25 = .35. Your call is .25 more, making the pot .60, so a pot-sized raise is .25 + .60 = .85.