MoCo begins operation in April, uses the perpetual method, and records merchandise purchases at net. MoCo makes two purchases on account. Terms are 1/15, n/45. On April 4, MoCo purchases merchandise for $3,000 which it pays for in April 16, On April 11, it makes a $9,000 purchase that it pays for on April 29, but there are no sales in April. On April 30, the balance in MoCo's inventory ledger account is... a. $12,000 b. $11,970 c. $11,880 d.$11,910