duplicate values in access query

I have to retrieve all loans made within last month  in each of our 50 branches.
When I run the query I get the right result but for example branch 2 has more than one value
Region      Branch code      Customer ID      Amount of loan
1                    2      78787      100
1      2      7678687      787
1      2      76768      1000
1      3      78887      1000
2      4      78787      8888

How can run a query that would return the result grouped by the region and then branch code, the count of the customer and the total sum of the amount of the loan?