Answer :
[tex]12.5\%[/tex]
1) We can solve this problem by writing the following ratios and then cross multiplying
2) Note that we're going to consider 80,000 as the 100%
[tex]\begin{gathered} 80,000-------100\% \\ 90,000-------x \\ x=\frac{90000\cdot100}{80000} \\ x=\frac{90000}{800}=112.5 \end{gathered}[/tex]We can now subtract 100 from that 112.5
[tex]112.5\%-100\%=12.5\%[/tex]3)Thus the percent of increase in that town was:
[tex]12.5\%[/tex]