Math

a photocopy store advertises the following prices: 5 cents per copy for the first 20 copies, 4 cents per copy for the 21st through 100th copy, and 3 cents per copy after the 100th copy. Let x be the # of copies, and let y = the total cost of the photocopying. find the equation in the form y = mx+b that tells you the cost of making x copes when x is more than 100.

asked by P
  1. 20 for 1.00
    then 4*.80 = 3.20 for 21 through 100
    so
    4.20 for 100

    y = 4.20 + .03 (x-100)

    y = .03 x - 1.20

    posted by Damon
  2. Thank you!

    posted by P

  3. cost for 0 copy to 20 copy =$ 1

    cost for 21 copy to 100 copy = 0.04*80 =$ 3.2

    cost for 101 copy to 200 copy) = 0.03*100 =$ 3

    then cost for 0 copy to 100 copy must be 4.2 dollars and the total cost for 200 copies must be 7.2 dollars.

    thus =>

    (y- 7.2)/(x-200) = (7.2-4.2)/(200-100)

    (y- 7.2)/(x-200) = 0.03

    (y- 7.2) = 0.03x - 6

    y = 0.03x + 7.2 - 6

    y = 0.03 + 1.2

    posted by uthpala
  4. Sorry, the answer must be
    y = 0.03x + 1.2

    posted by Uthpala

Respond to this Question

First Name

Your Response

Similar Questions

  1. Pre-Calculus

    A local photocopying store advertises as follows. " We charge 14 cents per copy for 150 copies or less,6 cents per copy for each copy over 150 but less than 230, and 3 cents per copy for each copy 230 and above. " Let x be the
  2. Pre-Calculus

    A local photocopying store advertises as follows. " We charge 14 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 230, and 3 cents per copy for each copy 230 and above. " Let x be the
  3. math

    A local photocopying store advertises as follows. " We charge 9 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 210 , and 3 cents per copy for each copy 210 and above. " Let x be the
  4. math

    The president of the country PTA organization makes copies of membership lists for all of the elementary schools. Sometimes she may need only few copies but at other times she needs thousands of copies. TIP copy Service charges 3
  5. math

    The president of the country PTA organization makes copies of membership lists for all of the elementary schools. Sometimes she may need only few copies but at other times she needs thousands of copies. TIP copy Service charges 3
  6. math

    I cant figure this thing out fully, I feel so clueless. Does anyone have any pointers or tips for me? Company needs a new copy machine. Rent costs are = 17.5 cents / each. Number of copies = atleast 200 000. (The company agrees to
  7. math,correction,help

    please can someone tell me where i am wrong. Directions: Translate to a system of equations and solve. Problem: Colored copies cost 10cents per copy and white copies cost 5cents per copy. Sandy made 400 copies, some of which were
  8. Math

    "How many ways are there to arrange some, but not all, of the letters in "Suspension" if at most once copy of each letter can be used? I have a start... I think the part that says "at most" one copy means that you have to remove
  9. Number Theory

    Yan was opening a new restaurant, so she went to the sign store to get letters to make a sign to hang above the storefront. When she got to the sign store, the only letters they had in stock were two copies of the letter 'X,' two
  10. Economics

    Hi there, I am having trouble with this problem.Can you give me some guidance. In planning the publication of a new engineering economics textbook, the publisher has identified the following fixed and variable costs. Fixed Costs

More Similar Questions