Admin can filter report by store. After installing the extension there will be a drop down of stores in the report. Selecting a store will show the report of that store. Very helpful if you have multiple stores.
Reports

1. Sales Report
   
2. Tax Report
   
3. Shipping Report
   
4. Returns Report
   
5. Coupons Report
   
6. Products Viewed Report
   
7. Products Purchased Report
   

Demo link: http://storewisereport.mightytech.org/admin
Username: admin
Password: admin