This is probably easy but im not smart so help I work at a local watch store. The price for each watch includes a mark-up to allow for the store to make profit. There is a watch that is being sold for $500 that I want to purchase. Since I work for the store, the owner agrees to sell it to me for $300, which is the price without the mark-up. Approximately what is the percentage of mark-up for this watch?

a- 33%
b-40%
c-60%
d-67%