Answer:
$84
Step-by-step explanation:
1. If 20% is marked off, then you are selling it for 80%.
2. 455 * 80% = 364
3. Since you are finding the cost markup from 280, then 364-280=84
Answer:
See explanation
Step-by-step explanation:
Jacob has 75 cookies.
He gave 2 cookies to each student.
Complete the table:

Let n be the number of students. After nth student arrived Jacob had left

cookies.
This is an arithmetic sequence with

Thus,

Answer:
8 and 7
Step-by-step explanation:
8 -7 = 1
8*7 = 56