Normal distribution Using R Programming

Suppose that visitors at a theme park spend an average of $100 on souvenirs. Assume that the money spent is normally distributed with a standard deviation of $10.

A) Between what two values will the middle 90% of the money spent fall?

B) If the theme park gives a free T-shirt for the top 5% of the spenders, what will be the minimum amount you have to spend to get the free T-shirt?

C) Show a plot for 10,000 visitors using the above distribution.