X and Y formed a corporation on April 1 this year. In exchange for 50 shares of stock, X transferred equipment worth $60,000 (basis $15,000) subject to a mortgage of $10,000, which the corporation assumed. In exchange for 50 shares of stock, Y contributed land worth $70,000 (basis $9,000) subject to a mortgage of $20,000, which the corporation assumed. What is the corporations basis in the land?

Group of answer choices

$20,000

$60,000

$5,000

$9,000

$15,000

$70,000