Sheffield Corp. is constructing a building. Construction began in 2020 and the building was completed 12/31/20. Sheffield made payments to the construction company of $3120000 on 7/1, $6468000 on 9/1, and $5870000 on 12/31. Weighted-average accumulated expenditures were
a. $3716000
b. $3177000.
c. $15458000.
d. $9588000