conditional sorting of data
 

I tried to sort data using autofilter and advanced filter. Both were not
helpful. My data has the following columns:

Date Name Transaction Qty

The transaction could be "Purchase" or "Sale". Under same names different
types of transactions could be there on different dates.

I want the "Qty" data for the latest date in respect of "Purchase" made by
each per son ( "names"). The latest date is different for different names.
However. When I used advanced filter I am not able to get the required data.
In the criteria range for advanced filter under the Date column I used
=Max() function to filter the latest date for each name. But I am getting
the latest date for the entire range put together (i.e., the max date of all
entries in Date column), instead of the max date for each name under
"Purchase". I tried Index and Match functions also; But I am not able to
frame the formula to suit my requirement using these two functions. Can
anyone help ? Thanks in advance