a) [tex]200\cdot\frac{3\not0}{10\not0}=\frac{200\cdot3}{10}=\frac{60\not0}{1\not0}=\boxed{60\,zl}[/tex]
c) [tex]200-60=140\\\\140\cdot\frac{4\not0}{10\not0}=\frac{140\cdot4}{10}=\frac{56\not0}{1\not0}=\boxed{56\,zl}[/tex]
b) [tex]140-56=84\\\\\frac{84}{2}=\boxed{42\,zl}[/tex]
d) [tex]84-42=\boxed{42\,zl}[/tex]
