Fix price

index.qmd

@@ -12,7 +12,7 @@
 This is the website for **Introduction to Modern Statistics**, Second Edition by Mine Çetinkaya-Rundel and Johanna Hardin.
 Introduction to Modern Statistics, which we'll refer to as IMS going forward, is a textbook from the [OpenIntro](https://www.openintro.org/) project.
 
-The book will always be available for free here. It is also available in PDF (for free or for the amount you choose to contribute) on Leanpub and in black&white paperback for purchase for $20.
+The book will always be available for free here. It is also available in PDF (for free or for the amount you choose to contribute) on Leanpub and in black&white paperback for purchase for $25.
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 <a href="https://leanpub.com/imstat" target="_blank"><img src="images/_icons/file.png" width="30px">&nbsp;<strong>Download PDF</strong></a>
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