题目

A bargain is something offered at a low and advantageous price. A more recent definition is: a bargain is a dirty trick to force money out of the pockets of silly and innocent people.        The cost of producing a new - for example - toothpaste would make 80p the proper price for it, so we will market it at £1.20. It is not a bad toothpaste, and as people like to try new things it will sell well to start with; but the attraction of novelty soon fades, so sales will fall. When that happens we will reduce the price to £1.15. And we will turn it into a bargain by printing 5p OFF 小明同学利用定滑轮设计了一种拉动窗帘的简易装置，如图所示，设计时他采用一根闭合的拉线绕在滑轮上，在右侧拉动这根拉线，就可以实现窗帘的打开与闭合，请你在图上画出这根拉线在滑轮上的绕法以及窗帘细线与拉线的连接．