1 bead costs $7.
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 29 beads cost?
(a)
Cost of every 10 beads
= 10 x 7 - 5
= 70 - 5
= $65
(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
= 65 + 14
= $79
(c)
Number of sets of 10 beads
= 29 ÷ 10
= 2 r 9
Cost of 20 beads
= 2 x 65
= $130
Cost of 9 beads
= 9 x 7
= $63
Cost of 29 beads
= 130 + 63
= $193
Answer(s): (a) $65; (b) $79; (c) $193