On January 1, 2019, Bernie and Amy formed a partnership to sell their cheesecakes. The partners each contributed $10,000 and agreed that all income and losses would be shared equally. For the fiscal period January 1 to December 31, 2019, the following information is available.

(1) The partnership earned income for tax purposes of $80,000. Included in this amount is a taxable capital gain of $35,000.

(2) The partnership made charitable donations of $1,500.

(3) Bernie took draws totalling $5,000.

(4) Bernie contributed additional capital of $20,000 to the partnership.

The adjusted cost base of Bernie's partnership interest at January 1, 2020, is:

a.$82,500

b.$46,750

c.$81,750

d.$64,250