Arthur has a bird shop that sells canaries. Arthur maintains accurate records on the number of birds purchased from its suppliers and the number sold to customers. The records show the following purchases and sales during $2024.$

Date Transactions                                 Units                        Unit Cost                    Total Cost

January $1$ Beginning inventory             $25$                             $$30$                             $$750$

April $14$ Purchase                                   $70322,240$

August $22$ Purchase                               $120344,080$

October $29$ Purchase                            $85363,060$

$300$ $$10,130$

January $1$ to December $31$ Sales $($$$50$ each$)270$

Arthur uses a periodic inventory system and believes there are $30$ birds remaining in ending inventory. However, Arthur neglects to make a final inventory count at the end of the year. An employee accidentally left one of the cages open one night and $10$ birds flew away, leaving only $20$ birds in ending inventory. Arthur is not aware of the lost canaries.

$4.$ Assuming that ending inventory is correctly counted at the end of $2025,$ what effect will the inventory error in $2024$ have on reported amounts for $($a$)$ ending inventory, $($b$)$ retained earnings, $($c$)$ cost of goods sold, and $($d$)$ net income $($ignoring tax effects$)$ in $2025?$