1 bead costs $6.
For every 10 beads bought, a discount of $3 is given.
- How much do 10 beads cost?
- How much do 19 beads cost?
- How much do 36 beads cost?
(a)
Cost of every 10 beads
= 10 x 6 - 3
= 60 - 3
= $57
(b)
Number of beads that do not belong to a set
= 19 ÷ 10
= 1 r 9
Cost of the 9 extra beads
= 9 x 6
= $54
Cost of 19 beads
= 57 + 54
= $111
(c)
Number of sets of 10 beads
= 36 ÷ 10
= 3 r 6
Cost of 30 beads
= 3 x 57
= $171
Cost of 6 beads
= 6 x 6
= $36
Cost of 36 beads
= 171 + 36
= $207
Answer(s): (a) $57; (b) $111; (c) $207