1 bead costs $6.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 17 beads cost?
- How much do 34 beads cost?
(a)
Cost of every 10 beads
= 10 x 6 - 5
= 60 - 5
= $55
(b)
Number of beads that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra beads
= 7 x 6
= $42
Cost of 17 beads
= 55 + 42
= $97
(c)
Number of sets of 10 beads
= 34 ÷ 10
= 3 r 4
Cost of 30 beads
= 3 x 55
= $165
Cost of 4 beads
= 4 x 6
= $24
Cost of 34 beads
= 165 + 24
= $189
Answer(s): (a) $55; (b) $97; (c) $189