1 bead costs $8.
For every 10 beads bought, a discount of $3 is given.
- How much do 10 beads cost?
- How much do 17 beads cost?
- How much do 28 beads cost?
(a)
Cost of every 10 beads
= 10 x 8 - 3
= 80 - 3
= $77
(b)
Number of beads that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra beads
= 7 x 8
= $56
Cost of 17 beads
= 77 + 56
= $133
(c)
Number of sets of 10 beads
= 28 ÷ 10
= 2 r 8
Cost of 20 beads
= 2 x 77
= $154
Cost of 8 beads
= 8 x 8
= $64
Cost of 28 beads
= 154 + 64
= $218
Answer(s): (a) $77; (b) $133; (c) $218