1 bead costs $9.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 14 beads cost?
- How much do 23 beads cost?
(a)
Cost of every 10 beads
= 10 x 9 - 5
= 90 - 5
= $85
(b)
Number of beads that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra beads
= 4 x 9
= $36
Cost of 14 beads
= 85 + 36
= $121
(c)
Number of sets of 10 beads
= 23 ÷ 10
= 2 r 3
Cost of 20 beads
= 2 x 85
= $170
Cost of 3 beads
= 3 x 9
= $27
Cost of 23 beads
= 170 + 27
= $197
Answer(s): (a) $85; (b) $121; (c) $197