1 bead costs $4.
For every 10 beads bought, a discount of $3 is given.
- How much do 10 beads cost?
- How much do 16 beads cost?
- How much do 25 beads cost?
(a)
Cost of every 10 beads
= 10 x 4 - 3
= 40 - 3
= $37
(b)
Number of beads that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra beads
= 6 x 4
= $24
Cost of 16 beads
= 37 + 24
= $61
(c)
Number of sets of 10 beads
= 25 ÷ 10
= 2 r 5
Cost of 20 beads
= 2 x 37
= $74
Cost of 5 beads
= 5 x 4
= $20
Cost of 25 beads
= 74 + 20
= $94
Answer(s): (a) $37; (b) $61; (c) $94