1 bead costs $5.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 14 beads cost?
- How much do 27 beads cost?
(a)
Cost of every 10 beads
= 10 x 5 - 5
= 50 - 5
= $45
(b)
Number of beads that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra beads
= 4 x 5
= $20
Cost of 14 beads
= 45 + 20
= $65
(c)
Number of sets of 10 beads
= 27 ÷ 10
= 2 r 7
Cost of 20 beads
= 2 x 45
= $90
Cost of 7 beads
= 7 x 5
= $35
Cost of 27 beads
= 90 + 35
= $125
Answer(s): (a) $45; (b) $65; (c) $125