\
\
Cost for each notebook
\
Cost for 3 notebooks
\
The numerical expression is
.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4d90f44d4ee257904d5e3e4f40b6ef5f.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4987cca40bb7cd8e353015bf52d1b82c.png\")
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=50fb7f2ebfbb4fcc954baed3bcbd11e3.png\")
.