Consolidated IS

Hello,

I am a bit confused about an exercise and it would be very helpful if someone can explain where I make mistakes. The problem goes like this:
” Tin Co acquired 90% of the equity share capital of Drum Co on 1 April 20×3. The following info relates to the financial year to 31 Dec 20×3 for each company.

Retained earnings at 1 Jan 20×3 840000(Tin co). 170000(Drum co)
Profit for the year. 70000. 60000
Ret earnings at 31 Dec 20×3. 910000. 230000

Neither co. paid dividends during the year. What profit is attributable to the parent co in the consolidated IS of Tin Group for the year to 31 dec 20×3?

I solved it like this:

Profit on consolidation: 130000

Profit attributable to:
– parent. 124000
-NCI. 10% x 60000= 6000

Movement in ret earn
Ret earn(parent): 840000
Post-aquisition earn: 90%x9/12×60000=40500
=> ret earn: 840000+40500+124000=1004500.

However, we are only interested in the consolidated profit. Therefore, we take 124000 and add to it 40500? But even so, I do not get the right answer.
The book only takes the 70000 profit of the parent and adds 40500- and I do not understand why- aren’t we supposed to add the profits for consolidation and afterwards appoint a proportion to each co?

Thank you!