Answer: To find out how much Moira would have been paid after working for 18 weeks, we need to multiply her fortnightly pay by the number of fortnights in 18 weeks.
Since there are 26 fortnights in a year, 18 weeks is equivalent to 18/26 = 9/13 of a year.
So, Moira's total pay after 18 weeks would be:
891.60 * 9/13 = $584.40
So, Moira would have been paid $584.40 after working for 18 weeks.
Explanation: