Answer:
22%
Step-by-step explanation:
1000-780=220
220/1000=0.22, or 22%
The answer is B because numbers 0-4 round down and numbers 5-9 round up
Step 1: Find the slope:

Step 2: Set up your equation
using one of the points.
Using (5,6) we have
.
Using (6,10) we have 
Both of those equations would be correct.