1 bead costs $9.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 18 beads cost?
- How much do 22 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
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra beads
= 8 x 9
= $72
Cost of 18 beads
= 85 + 72
= $157
(c)
Number of sets of 10 beads
= 22 ÷ 10
= 2 r 2
Cost of 20 beads
= 2 x 85
= $170
Cost of 2 beads
= 2 x 9
= $18
Cost of 22 beads
= 170 + 18
= $188
Answer(s): (a) $85; (b) $157; (c) $188