How much heat is needed to heat 8 kg of water from 10 * C to boiling in a 2.5 kg copper pot?

The change in the internal energy Qw of water is determined by the formula: Qw = Cw * mw (t1-t0), where Cw is the specific heat capacity (4200 J / kg * deg, mw is the mass of water, t1, t0 are the initial and final temperatures,
then for the pot Qk = Ck * mk (t1-t0) where CK is the specific heat capacity of copper (390 J / kg * deg).
t1-t0 = 100-10 = 90
The total energy is: Q = Qw + Qk = 4200 * 8 * 90 + 390 * 2.5 * 90 = 3024000 + 87750 = 3111750 J