1 bead costs $7.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 12 beads cost?
- How much do 25 beads cost?
(a)
Cost of every 10 beads
= 10 x 7 - 4
= 70 - 4
= $66
(b)
Number of beads that do not belong to a set
= 12 ÷ 10
= 1 r 2
Cost of the 2 extra beads
= 2 x 7
= $14
Cost of 12 beads
= 66 + 14
= $80
(c)
Number of sets of 10 beads
= 25 ÷ 10
= 2 r 5
Cost of 20 beads
= 2 x 66
= $132
Cost of 5 beads
= 5 x 7
= $35
Cost of 25 beads
= 132 + 35
= $167
Answer(s): (a) $66; (b) $80; (c) $167