how to find the per cent?

According to a government study among adults in the 25-to 34-year age group, the mean amount spent per year on reading and entertainment is $1960. Assume that the distribution of the amounts spent follows the normal distribution with a standard deviation of $450. Refer to the table in Appendix B.1. (Round z-score computation to 2 decimal places and the final answer to 2 decimal places.) a. What percentage of the adults spend more than $2300 per year on reading and entertainment? Percentage b. What percentage spend between $2300 and $3000 per year on reading and entertainment? Percentage % c. What percentage spend less than $1000 per year on reading and entertainment? Percentage 96