1 bead costs $9.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 17 beads cost?
- How much do 35 beads cost?
(a)
Cost of every 10 beads
= 10 x 9 - 4
= 90 - 4
= $86
(b)
Number of beads that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra beads
= 7 x 9
= $63
Cost of 17 beads
= 86 + 63
= $149
(c)
Number of sets of 10 beads
= 35 ÷ 10
= 3 r 5
Cost of 30 beads
= 3 x 86
= $258
Cost of 5 beads
= 5 x 9
= $45
Cost of 35 beads
= 258 + 45
= $303
Answer(s): (a) $86; (b) $149; (c) $303