20% of $45 is (20/100)*$45 = $<<(20/100)*45=9>>9

The price of the textbook in other bookshops cost $9 less than $45 which is $45-$9 = $<<45-9=36>>36

Three textbooks from the school bookshop would cost $45*3 = $<<45*3=135>>135

Three textbooks from another bookshop would cost $36*3 = $<<36*3=108>>108

Peter can save $135-$108 = $<<135-108=27>>27 by buying from another bookshop

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The price of a math textbook in the school bookshop is $45. If those sold in bookshops outside the school cost 20% less, how much can Peter save by buying from other bookshops rather than the school's if he wants to buy 3 math textbooks?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
27
The price of a math textbook in the school bookshop is $45. If those sold in bookshops outside the school cost 20% less, how much can Peter save by buying from other bookshops rather than the school's if he wants to buy 3 math textbooks?
train