Maci pays 10 * $0.10 = $<<10*0.10=1>>1 for the blue pens.

Each red pen costs 2*$0.10 = $<<2*0.10=0.20>>0.20

She pays 15*$0.20 = $<<15*0.20=3.00>>3.00 for the red pens.

To buy all the pens she needs, Maci pays $3+$1= $<<3+1=4>>4

# Answer

4
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
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?
train