Question 326509
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If he needs an average of 720 per month for 5 months, then the sum of the 5 months salaries must be 720 times 5 = 3600.  Add up the amounts he earned in the first 4 months and subtract that sum from 3600.  The difference will be the amount he needs to earn in the fifth month.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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