When i worked for office Max, back when they still existed, they told us to always always always push the "extended warranty"...
$4.00 on a $15.00 calculator... Even if you're making minimum wage, the time spent dicking around with the warranty crap, you could have bought a better calculator when the first broke.
$4 is 27% of $15. Are you telling me that this calculator has a greater than 27% chance of failing within 1 year? If so, I'll shop elsewhere. If not, your warranty is a ripoff and I'll shop elsewhere.