The ________ of a waiting line and the probability that the queue is empty add to one

A company has inventory of 20 units at a cost of $12 each on August 1. On August 5, it purchased 10 units at $13 per unit. On August 12 it purchased 15 units at $14 per unit. On August 15, it sold 30 units. Using the FIFO periodic inventory method, what is the value of Cost of goods sold on August 15?

a. $140. b. $160. c. $370. d. $210. e. $590.

When Ellen completed her life insurance application, she answered "No" to the question, "Have you ever had hepatitis?" She had hepatitis two years ago. If Ellen dies shortly after the policy is issued, the insurer may be able to deny the claim because of the doctrine of:

(a) concealment (b) insurable interest (c) warranty (d) misrepresentation