1 bead costs $5.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 13 beads cost?
- How much do 24 beads cost?
(a)
Cost of every 10 beads
= 10 x 5 - 4
= 50 - 4
= $46
(b)
Number of beads that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra beads
= 3 x 5
= $15
Cost of 13 beads
= 46 + 15
= $61
(c)
Number of sets of 10 beads
= 24 ÷ 10
= 2 r 4
Cost of 20 beads
= 2 x 46
= $92
Cost of 4 beads
= 4 x 5
= $20
Cost of 24 beads
= 92 + 20
= $112
Answer(s): (a) $46; (b) $61; (c) $112