200. 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?

$1   $2     $3      $4       $12

key is $3. 请问在这里10 fewer是什么意思？这到底怎么解呢？望各位NN指导

俺的方法是：假设current price 为 P

120/(P+1) = (120/P)- 10

解方程式，P为3.

10 fewer 指原来的价格增加$1, 用$120 只能少买10条。