1 bead costs $4.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 13 beads cost?
- How much do 38 beads cost?
(a)
Cost of every 10 beads
= 10 x 4 - 7
= 40 - 7
= $33
(b)
Number of beads that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra beads
= 3 x 4
= $12
Cost of 13 beads
= 33 + 12
= $45
(c)
Number of sets of 10 beads
= 38 ÷ 10
= 3 r 8
Cost of 30 beads
= 3 x 33
= $99
Cost of 8 beads
= 8 x 4
= $32
Cost of 38 beads
= 99 + 32
= $131
Answer(s): (a) $33; (b) $45; (c) $131