PUMA produces the PUMA Re- Suede, an athletic shoe made from sustainable materials. Identify the following costs connected with the manufacture of the Re- Suede shoe as variable or fixed:
a. Depreciation on equipment used to stitch the shoe together
b. Shoelaces
c. Patents on the process used to create the materials used in the shoe
d. Rice husk filler (used to make the rubber- like outsole)
e. Recycled polyester fibers (used to make the synthetic suede in the shoe upper)
f. Glue
g. Quality inspector’s salary