The average cost of an item is the same when the cost manager is running after each transaction and

I am using average costing

I do each transaction and run cost manager

the cost is doing average

example

item A has qty 10 and cost 10

receive a PO for price 10 , qty 10 and the price remain 10

now

I have two po for the same item and the cost manager is not running

the first po the price is 10 qty 10

the second po the price is 15 qty 10

perform receipt for the two pos

what will be the new average cost

((10*10) + (15*10) + (20 * 10 )) / 25+10