if we take 771 to be the 100%, and increase it by 98%, thus 100% + 98% = 198.
now, if 771 is the 100%, what is the 198%?
[tex]\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
771&100\\
a&198
\end{array}\implies \cfrac{771}{a}=\cfrac{100}{198}\implies \cfrac{771\cdot 198}{100}=a[/tex]
