Joshua uses a rule to write the following sequence of numbers 1/6,1/2,5//2 what rule did joshua use? what is the missing number in the sequence?

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?