Mrs. Matthew called me stupid for not knowing the answer to this so...May I please get some proper help?
The cost for a business to make greeting cards can be divided into one-time costs (e.g. a printing machine) and repeated costs (e.g. ink and paper). Suppose the total cost make 500 cards is $1,100, and the total cost to make 650 cards is 1,400. What is the total cost to make 1,000 cards? Round to the nearest dollar.
A. 2,000
B. 2,100
C. 2,250
D. 2,300
Mrs. Matthews has been banned from posting on Jiskha.
There probably is an algebraic formula for figuring this, but I'd break it down. If it costs $300 more to make 650 cards than 500, that's $300 per 150 cards. So, it would cost, $600 more to print 800 cards, etc. You figure it from there.
c = f + n v
or
cost = fixed + variable * number
that is a straight line
with slope v and c intercept f
1100 = f + (500) v
1400 = f + (650) v --subtract----
-------------------
-300 = -150 v
v = 2
then
100 = f
so
c = 100 + 2 n
if n = 1000
c = 100 + 2000 = 2100