$\$15\xf73=\$5\left(\mathrm{wed}\right)\phantom{\rule{0ex}{0ex}}\frac{5.505}{5}\times 100\%=10\%\phantom{\rule{0ex}{0ex}}\mathrm{Ans}:10\%\phantom{\rule{0ex}{0ex}}$ 



$\mathrm{Amount}\mathrm{spent}\mathrm{on}\mathrm{Wed}=\$15\xf73=\$5\phantom{\rule{0ex}{0ex}}\mathrm{Percentage}\mathrm{increase}\mathrm{Thur}\mathrm{to}\mathrm{Wed}=\frac{5.505}{5}\times 100\%=10\%\left(\mathrm{ans}\right)$ 


