We have that
Y - 5 = 0.5x2 + 6x - 3--------------- > y=0.5x2 + 6x -3+5=0.5x2 + 6x+2
y=0.5x2 + 6x +2
using a graphic tool
see the attached figure
the graph have two <span>x-intercepts----------> (-11.657,0) and (0.343,0)</span>
(5, -1)(10, 2) are solutions to this equation
SInce it is 25% increase, 25% of 100000 is 25000, so the answer is 100000 + 25000 = 125000.