Suppose you have a mean standardized score of 1200 points with a standard deviation of 200 points. this data is normally distributed. what is the z-score of 1000 points?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )