Answer:
$3.9
Step-by-step explanation:
In case you didn't understand, the question asks for you to increase the original price by 30%. So you multiply $3 by 130% which is also 3 x 1.3 = 3.9
[tex]\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{30\% of 3}}{\left( \cfrac{30}{100} \right)3}\implies 0.9 \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{so the cards sell for }}{3+0.9}\implies 3.9[/tex]
