Lopez Plastics Co. (LPC) issued callable bonds on January 1, 2018. LPC's accountant has projected the following amortization schedule from issuance until maturity:

Date	Cash interest			Effective interest			Decrease in balance			Outstanding balance
1/1/2018										$	207,020
6/30/2018	$	7,000		$	6,211		$	789			206,230
12/31/2018		7,000			6,187			813			205,417
6/30/2019		7,000			6,163			837			204,580
12/31/2019		7,000			6,137			863			203,717
6/30/2020		7,000			6,112			888			202,829
12/31/2020		7,000			6,085			915			201,913
6/30/2021		7,000			6,057			943			200,971
12/31/2021		7,000			6,029			971			200,000

LPC issued the bonds:

a. At par.

b. At a premium.

c. At a discount.

d. Cannot be determined from the given information.