Figure 1 is dilated to get figure 2. what is the scale factor? figure 1 is the smaller figure and has a 6 and figure 2 is bigger with the number 9. i would show a photo but i do not know how!

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! )