An electric toaster has resistance of 60Ω at room temperature (27 °...

Resistance at $27 ° C$, ${R}_{T = 27} = 60Ω$.

Final resistance, ${R}_{T} = \dfrac{220}{2 . 75} = 80Ω$.

Now, we can write $R = {R}_{0} ( 1 + \alpha\DeltaT )$

$⇒ 80 = 60\left[1 + 2 \times {10}^{- 4} ( T - 27 )\right]$

$⇒ T \approx 1694 ° C$