Need help with Transaction $15$:

$04.$ December $3$: Byte received $19$ Super Toners for resale to customers at a cost of $$21\mathrm{.}00$ per toner.

$05.$ December $10$: Byte sold $13$ Super Toners to a customer on account for $$50\mathrm{.}00$ each.

$10.$ December $16$: Byte received $13$ Super Toners purchased for resale to customers. The cost was $$31\mathrm{.}00$ per toner.

$14.$ December $19$: Byte sold $14$ Super toners to a customer on account for $$50\mathrm{.}00$ each.

$15.$ December $19$: Byte records the cost of the $14$ Super Toners sold using FIFO. The sales order number was $12101.$