Let
x-------> the whole number
y------> the decimal number
we know that
[tex]x*y=0.28[/tex] ------> equation 1
assume the value of x and then calculate the value of y
Let
x=280
solve for y in the equation 1
[tex]y= \frac{0.28}{x}[/tex]
substitute the value of x
[tex]y= \frac{0.28}{280}[/tex]
[tex]y=0.001[/tex]
therefore
the expression is equal to
280*0.001=0.28