ahemmm whatever% of anything is just (whatever/100) * anything.
therefore, 130% of 4 is just (130/100) * 4
and 130% of 7 is just (130/100) * 7
so the new size is
[tex]\bf 4+\left(\frac{130}{100}\cdot 4 \right)\implies 4+\cfrac{26}{5}\implies \cfrac{46}{5}\implies 9\frac{1}{5}
\\\\\\
7+\left( \frac{130}{100}\cdot 7 \right)\implies 7+\cfrac{91}{10}\implies \cfrac{161}{10}\implies 16\frac{1}{10}[/tex]
