1 bead costs $3.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 16 beads cost?
- How much do 22 beads cost?
(a)
Cost of every 10 beads
= 10 x 3 - 5
= 30 - 5
= $25
(b)
Number of beads that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra beads
= 6 x 3
= $18
Cost of 16 beads
= 25 + 18
= $43
(c)
Number of sets of 10 beads
= 22 ÷ 10
= 2 r 2
Cost of 20 beads
= 2 x 25
= $50
Cost of 2 beads
= 2 x 3
= $6
Cost of 22 beads
= 50 + 6
= $56
Answer(s): (a) $25; (b) $43; (c) $56