1 bead costs $8.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 18 beads cost?
- How much do 36 beads cost?
(a)
Cost of every 10 beads
= 10 x 8 - 5
= 80 - 5
= $75
(b)
Number of beads that do not belong to a set
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra beads
= 8 x 8
= $64
Cost of 18 beads
= 75 + 64
= $139
(c)
Number of sets of 10 beads
= 36 ÷ 10
= 3 r 6
Cost of 30 beads
= 3 x 75
= $225
Cost of 6 beads
= 6 x 8
= $48
Cost of 36 beads
= 225 + 48
= $273
Answer(s): (a) $75; (b) $139; (c) $273