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.
- Lucy wanted to place an order to print 390 A3-size copies of her poster. How much did she need to pay?
- Harry placed an order to print some A4-size copies of his poster. John 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 $233.40. How many A4-size copies of the poster did Harry print?
(a)
Amount that Lucy needed to pay
= 70 + 390 x 0.50
= $265
(b)
Total cost = $233.40
Printing cost excluding the basic printing charges
= 233.40 - 60 - 70
= $103.40
Amount of 1 A4 copy and 1 A3 copy if the cost per piece was between 1 to 49
= 0.60 + 1.00
= $1.60
Number of sets if the number of copies that each boy printed was between 1 to 49
= 103.40 ÷ 1.6
≈ 64.6 (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
= 0.35 + 0.75
= $1.10
Number of sets if the number of copies that each boy printed was between 50 to 99
= 103.40 ÷ 1.1
= 94 (✓) (Number of sets must be a whole number and is between 50 to 99.)
Number of A4-size copies of the poster that Harry printed = 94
Answer(s): (a) $265; (b) 94