1 bead costs $8.
For every 10 beads bought, a discount of $6 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 8 - 6
= 80 - 6
= $74
(b)
Number of beads that do not belong to a set
= 12 ÷ 10
= 1 r 2
Cost of the 2 extra beads
= 2 x 8
= $16
Cost of 12 beads
= 74 + 16
= $90
(c)
Number of sets of 10 beads
= 28 ÷ 10
= 2 r 8
Cost of 20 beads
= 2 x 74
= $148
Cost of 8 beads
= 8 x 8
= $64
Cost of 28 beads
= 148 + 64
= $212
Answer(s): (a) $74; (b) $90; (c) $212