-580
82 subtract by 20 = 62
600 x .15 = 90$ now subtract 90$ from 600$ and you get 510$
64
600 * 8 = 4,800
Subtract a negative 1. 19 - (-1) = 20
Exactly 20 of them
20
30
30
600
600
20% of 600 is 120. In order to figure that out, you multiple 600 x 0.2.120