The following balances were taken from the records of Cullumber Company:

Common stock $(1/1/20$ and $12/31/20)$ $$724,200$

Retained earnings $1/1/20$ $$161,000$

Net income for $2023181,000$

Dividends declared in $2023(41,000)$

Retained earnings, $12/31/20301,000$

Total stockholders' equity on $12/31/20$ $$1,025,200$

Marigold Company purchased $75\%$ of Cullumber Company's common stock on January $1,2021$ for $$901,500.$ The difference between implied value and book value is attributable to assets with a remaining useful life on January $1,2023$ of ten years.

$($a$)$

Compute the difference between cost$/($implied$)$ and book value applying:

Difference

$1.$ Parent company theory $

$2.$ Economic unit theory $