You can create a gauge chart by using pie chart or by using excel store app (Speed-o-meter) (Excel 2013 or later). Both are very easy to create.
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VBA MsgBox - How To Use This Information Tool
Five Simple & Useful Macro you shuld know.
You can use Round, Roundup, Rounddown & Mround function in excel to round numbers in excel. These functions are very to use & apply.
Trim, Clean, & Substitute Functions