1 bead costs $9.
For every 10 beads bought, a discount of $3 is given.
- How much do 10 beads cost?
- How much do 16 beads cost?
- How much do 24 beads cost?
(a)
Cost of every 10 beads
= 10 x 9 - 3
= 90 - 3
= $87
(b)
Number of beads that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra beads
= 6 x 9
= $54
Cost of 16 beads
= 87 + 54
= $141
(c)
Number of sets of 10 beads
= 24 ÷ 10
= 2 r 4
Cost of 20 beads
= 2 x 87
= $174
Cost of 4 beads
= 4 x 9
= $36
Cost of 24 beads
= 174 + 36
= $210
Answer(s): (a) $87; (b) $141; (c) $210