Estimate the discounts... Here is a problem on discount estimation,,

If marked price of an article is $\frac{8}{5}$ times cost price and its selling price is at least $\frac{4}{5}$th the cost price then discount percentage is...

multiple choices are possible...
options:
A) $25$
B) $40$
C) $50$
D) $60$
E) $80$
I am somewhat confused...
Thanks in advance....

HINT
Say the cost price is $x$, 
the maximum possible discount price =  $\frac{8}{5}(x) - \frac{4}{5}(x)$
$\implies $maximum possible discount percent = $\dfrac{\frac{8}{5}(x) - \frac{4}{5}(x)}{\frac{8}{5}(x)}\times 100$
Simplify and see which options are not greater than this percent
