Deleted Answer - containing links or inappropriate comments
Answer:
30 items are sold there
Step-by-step explanation:
21/0.7 --> 210/7=30
r=8
59 =7r+3
Subtract 3 from each side
59 -3 = 7r+3-3
56 = 7r
Divide each side by 7
56/7 = 7r/7
8 =r
$2,975
7/2 times 850