"The random variable D is normally distributed with mean equal to four times the standard deviation. It is given that P(D≤10)=0.045. Find the mean"

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.