Identify the property that justifies the work between step 3 and step 4
step 1: 19< 4x-5
step 2: 19+5< 4x-5+5
step 3: 24< 4x
step 4: (1/4)24< (1/4)4x
step 5: 6

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.

step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)