The table shows the charges for printing at a printing company. The cost per piece is based on the total number of copies to be printed.
- Betty wanted to place an order to print 480 A4-size copies of her poster. How much did she need to pay?
- Paul placed an order to print some A4-size copies of his poster. George placed an order to print some A3-size copies of his poster. Both of them ordered an equal number of copies of their posters. The total cost of their orders was $369.20. How many A4-size copies of the poster did Paul print?
(a)
Amount that Betty needed to pay
= 30 + 480 x 0.20
= $126
(b)
Total cost = $369.20
Printing cost excluding the basic printing charges
= 369.20 - 30 - 40
= $299.20
Amount of 1 A4 copy and 1 A3 copy if the cost per piece was between 1 to 49
= 0.70 + 1.10
= $1.80
Number of sets if the number of copies that each man printed was between 1 to 49
= 299.20 ÷ 1.8
≈ 166.2 (x) (Number of sets must be a whole number and is between 1 to 49.)
Amount of 1 A4 copy and 1 A3 copy if the cost per piece was between 50 to 99
= 0.45 + 0.85
= $1.30
Number of sets if the number of copies that each man printed was between 50 to 99
= 299.20 ÷ 1.3
≈ 230.2 (x) (Number of sets must be a whole number and is between 50 to 99.)
Amount of 1 A4 copy and 1 A3 copy if the cost per piece was between 100 to 499
= 0.20 + 0.60
= $0.80
Number of sets if the number of copies that each man printed was between 100 to 499
= 299.20 ÷ 0.80
= 374 (✓) (Number of sets must be a whole number and is between 100 to 499.)
Number of A4-sized copies that Paul printed = 374
Answer(s): (a) $126; (b) 374