1 bead costs $8.
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 8 - 4
= 80 - 4
= $76
(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
= 76 + 16
= $92
(c)
Number of sets of 10 beads
= 25 ÷ 10
= 2 r 5
Cost of 20 beads
= 2 x 76
= $152
Cost of 5 beads
= 5 x 8
= $40
Cost of 25 beads
= 152 + 40
= $192
Answer(s): (a) $76; (b) $92; (c) $192