I think your pressure, 2.48 EE 5 is off. It probably should be 2.48 EE 2 atm, considering 1 atm per 10 meter a general guide.

So, delta P is 248 - 1 = 247 atmospheres.

Assuming Beta value is correct:

49.5x10^-6 =(-deltaV)/Vi x deltaP =(-deltaV)/Vi x 247

(deltaV)/Vi =-.012

deltaV = -.012Vi

indicates a 1.2% contraction in volume

final density/ini density =Vi/Vf = Vi/.988Vi = 1.012

final dens = 1.012(1.025kg/L)