1 bead costs $7.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 15 beads cost?
- How much do 32 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
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra beads
= 5 x 7
= $35
Cost of 15 beads
= 66 + 35
= $101
(c)
Number of sets of 10 beads
= 32 ÷ 10
= 3 r 2
Cost of 30 beads
= 3 x 66
= $198
Cost of 2 beads
= 2 x 7
= $14
Cost of 32 beads
= 198 + 14
= $212
Answer(s): (a) $66; (b) $101; (c) $212