22-16.A manufacturing firm with a single plant is contemplating changing its plant size. It must choose from among seven alternative plant sizes. In the table below, plant size A is the smallest it might build, and size G is the largest. Currently, the firm's plant size is B.

1. a.At plant size B, is this firm currently experiencing economies of scale or diseconomies of scale?
2. b.What is the firm's minimum efficient scale?