Maci is planning for the new school year and goes to the store to buy pens. She needs ten blue pens and 15 red pens. If a blue pen costs ten cents each and a red pen costs twice as much as the blue pen, how much money does Maci pay for the pens?
Maci pays 10 * $0.10 = $
<gadget id="calculator">10*0.10</gadget>
<output>1</output>
1 for the blue pens.
Each red pen costs 2*$0.10 = $
<gadget id="calculator">2*0.10</gadget>
<output>0.2</output>
0.20.
She pays 15*$0.20 = $
<gadget id="calculator">15*0.20</gadget>
<output>3</output>
3.00 for the red pens.
To buy all the pens she needs, Maci pays $3+$1= $
<gadget id="calculator">3+1</gadget>
<output>4</output>
4.

<result>4</result>