That is, the length (m) times the width (m) times the thickness (m) times the specific gravity of the film times the current price (yuan per ton) = the number of meters of the material. For example, 0.2m (length) times 0.3m (width) times 0.02MM (thickness) times 0.92 (specific gravity) times 17 yuan equals 0.0 187 yuan.