We can however go 1 step further and use the networkdays function.
This will give you the amount you can spend over a 5 day working week.
Excel 2007<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><COLGROUP><COL style="BACKGROUND-COLOR: #e0e0f0" width=25><COL><COL></COLGROUP><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH></TH><TH>A</TH><TH>B</TH></TR></THEAD><TBODY><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">1</TD><TD style="TEXT-ALIGN: right">190</TD><TD style="TEXT-ALIGN: right">1322648</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">2</TD><TD style="TEXT-ALIGN: right"></TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">3</TD><TD style="TEXT-ALIGN: right">572.8214182</TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">4</TD><TD style="TEXT-ALIGN: right">725.4850202</TD><TD style="TEXT-ALIGN: right"></TD></TR></TBODY></TABLE>
Sheet1
<TABLE style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; PADDING-BOTTOM: 0.4em; BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 0.4em; PADDING-RIGHT: 0.4em; BORDER-COLLAPSE: collapse; BORDER-TOP: black 2px solid; BORDER-RIGHT: black 2px solid; PADDING-TOP: 0.4em" rules=all cellPadding=2 width="85%"><TBODY><TR><TD style="PADDING-BOTTOM: 6px; PADDING-LEFT: 6px; PADDING-RIGHT: 6px; PADDING-TOP: 6px">
Worksheet Formulas<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; TEXT-ALIGN: center; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2 width="100%"><THEAD><TR style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH width=10>Cell</TH><TH style="TEXT-ALIGN: left; PADDING-LEFT: 5px">Formula</TH></TR></THEAD><TBODY><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>A3</TH><TD style="TEXT-ALIGN: left">=(
$B$1+($A$1*(44197-TODAY())))/(
44197-TODAY())</TD></TR><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>A4</TH><TD style="TEXT-ALIGN: left">=(
$B$1+($A$1*NETWORKDAYS(TODAY(),"1/1/2021")))/NETWORKDAYS(
TODAY(),"1/1/2021")</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>