1 bead costs $3.
For every 10 beads bought, a discount of $6 is given.
- How much do 10 beads cost?
- How much do 14 beads cost?
- How much do 31 beads cost?
(a)
Cost of every 10 beads
= 10 x 3 - 6
= 30 - 6
= $24
(b)
Number of beads that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra beads
= 4 x 3
= $12
Cost of 14 beads
= 24 + 12
= $36
(c)
Number of sets of 10 beads
= 31 ÷ 10
= 3 r 1
Cost of 30 beads
= 3 x 24
= $72
Cost of 1 beads
= 1 x 3
= $3
Cost of 31 beads
= 72 + 3
= $75
Answer(s): (a) $24; (b) $36; (c) $75