TrackR, Inc., (TI) has developed a coin-sized tracking tag that attaches to key rings, wallets, and other items and can be prompted to emit a signal using a smartphone app. TI sells these tags, as well as water-resistant cases for the tags, with terms FOB shipping point. Assume TI has no inventory at the beginning of the month, and it has outsourced the production of its tags and cases. TI uses FIFO and has entered into the following transactions:

Jan. 2: TI purchased and received 300 tags from Xioasi Manufacturing (XM) at a cost of $9 per tag, n/15.

Jan. 4: TI purchased and received 100 cases from Bachittar Products (BP) at a cost of $2 per case, n/20.

Jan. 6: TI paid cash for the tags purchased from XM on Jan. 2.

Jan. 8: TI mailed 200 tags via the U.S. Postal Service (USPS) to customers at a price of $30 per tag, on account.

Jan. 11: TI purchased and received 400 tags from XM at a cost of $12 per tag, n/15.

Jan. 14: TI purchased and received 200 cases from BP at a cost of $3 per case, n/20.

Jan. 16: TI paid cash for the cases purchased from BP on Jan. 4.

Jan. 19: TI mailed 160 cases via the USPS to customers at a price of $10 per case, on account.

Jan. 21: TI mailed 300 tags to customers at a price of $30 per tag.

Required:

1. Prepare journal entries for each of the above dates, assuming TI uses a perpetual inventory system.

2. Calculate the dollars of gross profit and the gross profit percentage from selling (a) tags and (b) cases.

3. Which product line yields more dollars of profit?

4. Which product line yields more profit per dollar of sales?