a)
\frac{160}{240} * 100\%=\frac{2}{3} * 100\%=\frac{200}{3}\%=66\frac{2}{3}\%
b)
\frac{200}{240} * 100\%=\frac{5}{6}*100\%=83\frac{1}{3}\%
c)
\frac{10,5}{240}*100\%=\frac{1050}{240}\%=4\frac{3}{8}\%
d)
(13\frac{1}{3}:240)*100\%=\frac{40}{3}*\frac{1}{240}\%=\frac{1}{18}\%