So, 3 tenths is \(\frac{3}{10}\)
I understand it as: the answer will be 80% plus \(\frac{3}{10}\) of 80 %, how much is that?
\(\frac{3}{10}*80= \frac{3*80}{10}=\frac{3*8}{1}=24\)
so we have to add 24% to 80: this is 104.
so 104% is 3/10th times greater than 80%.