Floral Arrangement Budget Problem

A florist has a total of $240 to spend on two types of floral arrangements for a wedding. The cost of each centerpiece arrangement is $15, and the cost of each floral bouquet is $12. If the florist decides to buy x centerpieces and y bouquets, the combined cost must not exceed the total budget. Additionally, the florist needs at least 10 centerpieces for the wedding. How many more bouquets could the florist buy if they choose to purchase 8 centerpieces?