Using IRAC analyze this legal problem:

Hungry Helen's Dessert Bar (HHDB) contracted with Annapolis Valley Pie Masters (AVPM) to purchase 100 pies at a certain rate per pie.An early frost destroyed many apple crops, and the price of apples went up by 25%.AVPM contacted HHDB to ask if they would pay more so that AVPM wouldn't be selling them at a loss.HHDB agreed to pay the new price. The pies were delivered.HHDB later refused to pay the new amount and only paid the amount in the initial contract.What is AVPM's legal position?