Assume it costs a manufacturer $80 to produce a pair of sunglasses. The manufacturer sells the sun-glasses to a fashion designer for $100. The fashion designer puts its brand name on the sunglasses and sells them to an optical retail stores for $160. The optical retail stores then sell the sunglasses to the end customers at $320.

Required
1. What is the markup percentage between the following: 

a. Manufacturer and the fashion designer? 

b. Fashion designer and the optical retail store? 

c. Optical retail store to the end customer?
2. What is the total markup from the manufacturer to the end customer?