1 bead costs $4.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 12 beads cost?
- How much do 28 beads cost?
(a)
Cost of every 10 beads
= 10 x 4 - 5
= 40 - 5
= $35
(b)
Number of beads that do not belong to a set
= 12 ÷ 10
= 1 r 2
Cost of the 2 extra beads
= 2 x 4
= $8
Cost of 12 beads
= 35 + 8
= $43
(c)
Number of sets of 10 beads
= 28 ÷ 10
= 2 r 8
Cost of 20 beads
= 2 x 35
= $70
Cost of 8 beads
= 8 x 4
= $32
Cost of 28 beads
= 70 + 32
= $102
Answer(s): (a) $35; (b) $43; (c) $102