diff --git a/quarto/basics/calculator.qmd b/quarto/basics/calculator.qmd
index a4676bb..a85d1a4 100644
--- a/quarto/basics/calculator.qmd
+++ b/quarto/basics/calculator.qmd
@@ -272,7 +272,7 @@ The percentage error in $x$ if $y$ is the correct value is $(x-y)/y \cdot 100$.
 
 ##### Example
 
-The *percentage decrease* of an item is $(o-n)/o \cdot 100$ with $o$ being the original price and $n$ being the new one. If a drug that cost 60 dollars is not 55 dollars what is the percentage decrease?
+The *percentage decrease* of an item is $(o-n)/o \cdot 100$ with $o$ being the original price and $n$ being the new one. If a drug that cost 60 dollars is now 55 dollars what is the percentage decrease?
 
 ```{julia}
 (60 - 50) / 60 * 100