I'm completely lost with this math problem: Two stores sell the same model of smartphone, but they offer it at different prices and with different discounts. Store A lists the smartphone at a full price of $125 and offers an additional discount of 8%.  Store B lists the same smartphone for $130 and offers an additional discount of 10%.  After both stores' discounts are applied, how much cheaper is store A's smartphone than store B's smartphone?
Can you give me a hand?