Comparing two columns in excel to find duplicates

Quite often, you have to compare two columns in excel to find duplicates or 'missing' rows. Though there are many ways to do this, the following MS article gives a simple solution.

https://support.microsoft.com/kb/213367?wa=wsignin1.0

Depreciation of fixed assets in accounting

Would like to recommend the following site that gives a very simple explanation of the concept of depreciation in accounting. Worth a perusal for beginners.

http://accounting-simplified.com/financial/fixed-assets/depreciation-methods/