Grocery mart has cookies on sale for $3.84 for 12 cookies. food shoppe has cookies on sale for %5.70 for 19 cookies. which store has a better deal on cookies?

i'm too lazy to do it and i need an answer asap.

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?