16,24,40,48 and then what number after

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?

2x minus y equals 6, x plus y equals negative 3

Which answer choice is it? is it the first ,second, third or fourth giving 40 points for whoever answers correctly you