OG12 P180 195 a store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by$1, 10 fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel? 这道题 我没看懂,for 120$ 到底是什么意思 谢谢大牛指点~~