If you brought a stock last year for a price of $106,and it has gone down 15%since then, how much is the stock worth now, to the nearest cent

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.