التوثيق

ea_month    id       amount    ea_year    circle_id
April       92570    1000      2014        1
April       92571    3000      2014        2
April       92572    2000      2014        3
March       92573    3000      2014        1
March       92574    2500      2014        2
March       92575    3750      2014        3
February    92576    2000      2014        1
February    92577    2500      2014        2
February    92578    1450      2014        3   

select branch_id,
       net_profit as store_profit,
       (select sum(net_profit) from store_sales as s2 where s2.city = s1.city) as city_profit,
       store_profit / city_profit * 100 as store_percentage_of_city_profit
    from store_sales as s1
    order by branch_id;
+-----------+--------------+-------------+---------------------------------+
| BRANCH_ID | STORE_PROFIT | CITY_PROFIT | STORE_PERCENTAGE_OF_CITY_PROFIT |
|-----------+--------------+-------------+---------------------------------|
|         1 |     10000.00 |    25000.00 |                     40.00000000 |
|         2 |     15000.00 |    25000.00 |                     60.00000000 |
|         3 |     10000.00 |    19000.00 |                     52.63157900 |
|         4 |      9000.00 |    19000.00 |                     47.36842100 |
+-----------+--------------+-------------+---------------------------------+

SELECT ea_month, id, amount, ea_year, circle_id
     , sum(amount) OVER (PARTITION BY circle_id
                         ORDER BY ea_year, ea_month) AS cum_amt
FROM   tbl
ORDER  BY circle_id, month;