You have the following product:
(-2/5) x (-0.8)
In order to solve the previous multiplication, write the decimal number as a fraction.
Consider that the fraction associated to 0.8 is a fraction with the numerator equal to 8 and the denominator is 1 next by the same number of zeros you have in the decimal number. You have one zero, then the fraction is:
0.8 = 8/10
replace the previous fraction in the given product:
(-2/5)x(-8/10)
multiply numerator with numerator and denominator with denominator,
moreover, use the signs multiplication rule:
(-2/5)x(-8/10) = 16/50 simplify the fraction
16/50 = 8/25 = 0.32
Hence, the solution to the given product is 8/25 and 0.32