1 bead costs $6.
For every 10 beads bought, a discount of $6 is given.
- How much do 10 beads cost?
- How much do 15 beads cost?
- How much do 28 beads cost?
(a)
Cost of every 10 beads
= 10 x 6 - 6
= 60 - 6
= $54
(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
= 54 + 30
= $84
(c)
Number of sets of 10 beads
= 28 ÷ 10
= 2 r 8
Cost of 20 beads
= 2 x 54
= $108
Cost of 8 beads
= 8 x 6
= $48
Cost of 28 beads
= 108 + 48
= $156
Answer(s): (a) $54; (b) $84; (c) $156