1 bead costs $3.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 15 beads cost?
- How much do 25 beads cost?
(a)
Cost of every 10 beads
= 10 x 3 - 4
= 30 - 4
= $26
(b)
Number of beads that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra beads
= 5 x 3
= $15
Cost of 15 beads
= 26 + 15
= $41
(c)
Number of sets of 10 beads
= 25 ÷ 10
= 2 r 5
Cost of 20 beads
= 2 x 26
= $52
Cost of 5 beads
= 5 x 3
= $15
Cost of 25 beads
= 52 + 15
= $67
Answer(s): (a) $26; (b) $41; (c) $67