Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions:
Suppose that of 300 mice in a mice colony born in January, 150 are still alive at the start of September, and 120 are still alive at the start of October.
-If the survivorship at the start of November is 0.3, how many mice died during the month of November?

A) 10
B) 20
C) 30
D) 60
E) 90