What is the tens digit of 36^30?	Choices.
A) 1
B) 7
C) 5
D) 3
E) 9
36^10 = 6^20   (6^2)=6*6= 
<gadget id="calculator">6*6</gadget>
<output>36</output>
36   (6^3)= 36*6 = .16   (6^4)= .16*6 = ..96   (6^5) = ..96*6 = ..76   (6^6) = ..76*6 = ...56   (6^7) = ....56*6 = ....36   If you see there is a pattern here in tens digits 3,1,9,7,5,3,1 and so on...   Continue the pattern up to 6^30 ( dont actually calculate full values) and answer is 7: 7
<result>B</result>
What is the tens digit of 36^30?