Answer:
company 1 is offering the cheapest plan.
Step-by-step explanation:
Since company 1 charges 0.04 cents per text messages.
So for 500 text messages total charges by the company = 0.04×500 = $20
Now at the same time company B is charging
from 0 - 100 messages = $5
from 101 - 200 messages = $10
from 201 - 300 messages = $15
from 301 - 400 messages = $20
from 401 - 500 messages = $25
Total charges for 500 text messages = 5 + 10 + 15 + 20 + 25 = $75
So, company 2 is costlier than company 1.
Therefore, company 1 is offering the cheapest plan.