Your friend is shopping with you and also decides to purchase a Women's Coat for $180.00 (original price). The item is also on sale for 60% off the original price. The coupon she received in the mail also allows her to take an additional 15% off the sale price. Another friend decides to purchase a pair of Jeans for $90. This item is also on sale for 60% off the original price with an additional 15% off the sale price.
Does the overall percentage of savings (successive percentage change) depend on the price? Justify your answer numerically or discuss the successive percent formula as support.