Required information: 
Prancer Inc. (Prancer) purchased 40,000 voting shares out of Starter Corporation's 50,000 outstanding voting shares for $320,000 on January 1, 2023. On the date of acquisition, the fair value of the non-controlling interest was: 
a) $64,000 
b) $80,000 
c) $320,000 
d) $400,000