let's first off, convert the mixed fraction to improper fraction, and then to decimal and then to percent.
[tex]\bf \stackrel{mixed}{6\frac{8}{15}}\implies \cfrac{6\cdot 15+8}{15}\implies \stackrel{improper}{\cfrac{98}{15}} \\\\\\ \stackrel{\textit{on to decimal}}{98\div 15\implies 6.5\overline{3}}\implies \stackrel{\textit{on to percent}}{6.5\overline{3}\cdot 100\implies 653.\overline{3}\%}[/tex]
