When a figure is rotated 180 degrees, and 270 degrees around an origin what does (a, b) turn into? i know for 90 (a, b) turns to (-b, a) but im not sure about the others.

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?