1 bead costs $5.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 14 beads cost?
- How much do 21 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
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra beads
= 4 x 5
= $20
Cost of 14 beads
= 46 + 20
= $66
(c)
Number of sets of 10 beads
= 21 ÷ 10
= 2 r 1
Cost of 20 beads
= 2 x 46
= $92
Cost of 1 beads
= 1 x 5
= $5
Cost of 21 beads
= 92 + 5
= $97
Answer(s): (a) $46; (b) $66; (c) $97