The original price p for a necklace is the same at both jewelry stores. at store a, the sale price is 60% of the original price. last month, at store b, the sale rice was $40 less than the original price. this month, store b is selling the necklace for 80% of last months reduced price. the current sale prices are the same for both stores. write and solve an equation to find the original price of the necklace.