2,800 but i need 3.5 how many liters is that

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?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a