Katya has $20.00 to spend at her college bookstore, where all students receive a 20% discount. Katya wants to purchase a copy of a book that normally sells for $22.50 plus 10% sales tax. Does Katya have enough money? By how much or how little?

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities