1 bead costs $6.
For every 10 beads bought, a discount of $6 is given.
- How much do 10 beads cost?
- How much do 16 beads cost?
- How much do 23 beads cost?
(a)
Cost of every 10 beads
= 10 x 6 - 6
= 60 - 6
= $54
(b)
Number of beads that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra beads
= 6 x 6
= $36
Cost of 16 beads
= 54 + 36
= $90
(c)
Number of sets of 10 beads
= 23 ÷ 10
= 2 r 3
Cost of 20 beads
= 2 x 54
= $108
Cost of 3 beads
= 3 x 6
= $18
Cost of 23 beads
= 108 + 18
= $126
Answer(s): (a) $54; (b) $90; (c) $126