Twice the sum of a number and eight

2(x+8) or 2x + 16

Step-by-step explanation:

this means two times: 8 plus a number.

let's call the number x

= 2(x+8) or 2x + 16

wholesale price is the initial price before markup. retail price comes after the markup.

a price of 8 bucks that's marked up by 100%   is

formula: initial price + (percent markup in fraction/decimal)(initial price)

8+(1)(8)

8+8

16

retail price is $16.