Use the Basic Counting Rule to Solve the Problem

Multiple Choice

Use the basic counting rule to solve the problem.
-Mark can remember only the first 3 digits of his friend's phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark were to dial all of the possible numbers And if it takes him 24 seconds to try each one, how long would it take to try every possibility?

A) 400.1 minutes
B) 3600 minutes
C) 16 minutes
D) 4000.8 minutes