1 bead costs $5.
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 35 beads cost?
(a)
Cost of every 10 beads
= 10 x 5 - 5
= 50 - 5
= $45
(b)
Number of beads that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra beads
= 6 x 5
= $30
Cost of 16 beads
= 45 + 30
= $75
(c)
Number of sets of 10 beads
= 35 ÷ 10
= 3 r 5
Cost of 30 beads
= 3 x 45
= $135
Cost of 5 beads
= 5 x 5
= $25
Cost of 35 beads
= 135 + 25
= $160
Answer(s): (a) $45; (b) $75; (c) $160