a)[tex]\frac{257}{100} * \frac{2}{5} =\frac{514}{500}[/tex]
b)[tex]\frac{513}{1000} * \frac{52}{10} = \frac{26 676}{10000}[/tex]
c)[tex]\frac{3}{100} *\frac{257}{1000} = \frac{771}{100000}[/tex]
