A briefcase has a number-lock system containing a combination of 3 digits (Each digit can be of numbers 0 to 8). If the correct combination is unknown, how much maximum time would be required to open the bag if each “trial” of combination takes 3 seconds? Choose the correct answer:
A) 36.45 minutes  B) 36.47 minutes  C) 36.41 minutes  D) 36.42 minutes  E) 36.65 minutes

Rationale: explanation : maximum number of trials required = 9 * 9 * 9 = 729 . since for each combination trial , 3 seconds are required to open the briefcase is given as 3 * 729 = 2187 seconds = 36.45 minutes . answer : a
Answer: A