Chapter 6, Problem 22A

Pieces of the following lengths are cut from a 15-inch steel bar: $2\frac{1\text{'}\text{'}}{2},1\frac{3\text{'}\text{'}}{4},1\frac{7\text{'}\text{'}}{8}$and $\frac{5\text{'}\text{'}}{16}$ .Allowing $\frac{1}{8}$inch waste for each cut, what is the length of bar left after the pieces are cut?