Answer:
(C)
10
Step-by-step explanation:
Let y = cost of items
Let x = number of items
Total cost = fixed charge + (cost per item x number of items)
Given:
company A fixed charge = $50 , cost per item = $7
company B fixed charge = $30 , cost per item = $9
For company A,
Total Cost = $50 + ($7 x number of items),
or
y = 50 + 7x
Similarly for company B,
Total Cost = $30 + ($9 x number of items),
or
y = 30 + 9x
Hence (C) is the correct answer.
For the cost to be the same, Total cost for A = total cost for B
i.e 50 + 7x = 30 + 9x
x = 10 items (Answer)
