1 bead costs $9.
For every 10 beads bought, a discount of $6 is given.
- How much do 10 beads cost?
- How much do 17 beads cost?
- How much do 32 beads cost?
(a)
Cost of every 10 beads
= 10 x 9 - 6
= 90 - 6
= $84
(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
= 84 + 63
= $147
(c)
Number of sets of 10 beads
= 32 ÷ 10
= 3 r 2
Cost of 30 beads
= 3 x 84
= $252
Cost of 2 beads
= 2 x 9
= $18
Cost of 32 beads
= 252 + 18
= $270
Answer(s): (a) $84; (b) $147; (c) $270