1 bead costs $8.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 15 beads cost?
- How much do 24 beads cost?
(a)
Cost of every 10 beads
= 10 x 8 - 7
= 80 - 7
= $73
(b)
Number of beads that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra beads
= 5 x 8
= $40
Cost of 15 beads
= 73 + 40
= $113
(c)
Number of sets of 10 beads
= 24 ÷ 10
= 2 r 4
Cost of 20 beads
= 2 x 73
= $146
Cost of 4 beads
= 4 x 8
= $32
Cost of 24 beads
= 146 + 32
= $178
Answer(s): (a) $73; (b) $113; (c) $178