Can someone please explain the calculation steps to me in this? I understand it should be really easy, but I'm just not getting it atm ![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
http://www4.boardofstudies.nsw.edu....wer=C&courseID=15050&testQuestionID=301801752
And also; http://www4.boardofstudies.nsw.edu....wer=D&courseID=15050&testQuestionID=301801755
http://www4.boardofstudies.nsw.edu....wer=C&courseID=15050&testQuestionID=301801752
And also; http://www4.boardofstudies.nsw.edu....wer=D&courseID=15050&testQuestionID=301801755
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