SQL & PL/SQL :: Get Total Sales Dollar Amount From Two Tables Without Cursor?

I got this intertesting request from one of my client some time ago and is still trying to find an answer.

Getting total sales dollar amount from two tables.

T1
Item_no(number)Total_Sales_Number(number)
160
250
35
420

T2
Item_no(number)Sales_Date(date)Sales_Number(number)Sale_Price(number)
12012-01-012015
12012-02-153012
22012-01-104016
22012-03-053018
32012-02-011020

Required to generate report to total sale dollar amount by combining information from T1 and T2 (matching with item_no). Rules are
a)Formula is Sales_Number*Sale_price
b)Choose the earliest sale record to latest by Sales_Date with the sum of Sales_Number is less or equal the Total_Sales_Number from T1.
c)If the sum of Sales_Number is less than the Total_Sales_Number from T1, then the use a fixed price for all items, say $10
d)If a item is not in T2 then use $10 for the price

For example,
item_no 1:
Total sale dollar amount = 20*$15+30*$15+(60-20-30)*$10

item_no 2:
Total sale dollar amount = 40*$16+(50-40)*$18
item_no 3:
Total sale dollar amount = 5*$20
item_no 4:
Total sale dollar amount = 20*$10

The current logic is done by using cursor. Can this be done without cursor using such as analytical statements? The Oracle DB is 9i.