During $2024,$ Lipe and Lipe Corporation discovered that its ending inventories reported on its financial statements were misstated by the following amounts:

$\backslash$table$[[$p$,$understated by$,000],[,$overstated by$,210\mathrm{.}000]]$

Lipe and Lipe uses the periodic inventory system and the FIFO cost method.

Required:

$1-$a$.$ Determine the effect of $2022$ errors on retained earnings at January $1,2024,$ before any adjustments. $($Ignore income taxes.$)$

$1-$b$.$ Determine the effect of $2023$ errors on retained earnings at January $1,2024,$ before any adjustments. $($Ignore income taxes.$)$

$2.$ Prepare a journal entry to correct the error in $2024.$

$3.$ Will Lipe and Lipe account for the error $($a$)$ retrospectively or $($b$)$ prospectively?