1 bead costs $6.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 15 beads cost?
- How much do 22 beads cost?
(a)
Cost of every 10 beads
= 10 x 6 - 5
= 60 - 5
= $55
(b)
Number of beads that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra beads
= 5 x 6
= $30
Cost of 15 beads
= 55 + 30
= $85
(c)
Number of sets of 10 beads
= 22 ÷ 10
= 2 r 2
Cost of 20 beads
= 2 x 55
= $110
Cost of 2 beads
= 2 x 6
= $12
Cost of 22 beads
= 110 + 12
= $122
Answer(s): (a) $55; (b) $85; (c) $122