Maria bought 10 notebooks and 5 pens costing 2 dollars each.How much did Maria pay?  Pick.
A) $10 B) $20 C) $30 D) $40 E) $50
2 × (10 + 5) = 2 × 10 + 2 × 5 = 20 + 10= 
<gadget id="calculator">20 + 10</gadget>
<output>30</output>
30 dollars   correct answer is $30)$30
<result>C</result>
Maria bought 10 notebooks and 5 pens costing 2 dollars each.How much did Maria pay?