1 bead costs $9.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 19 beads cost?
- How much do 24 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
= 19 ÷ 10
= 1 r 9
Cost of the 9 extra beads
= 9 x 9
= $81
Cost of 19 beads
= 85 + 81
= $166
(c)
Number of sets of 10 beads
= 24 ÷ 10
= 2 r 4
Cost of 20 beads
= 2 x 85
= $170
Cost of 4 beads
= 4 x 9
= $36
Cost of 24 beads
= 170 + 36
= $206
Answer(s): (a) $85; (b) $166; (c) $206