1 bead costs $9.
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 37 beads cost?
(a)
Cost of every 10 beads
= 10 x 9 - 5
= 90 - 5
= $85
(b)
Number of beads that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra beads
= 7 x 9
= $63
Cost of 17 beads
= 85 + 63
= $148
(c)
Number of sets of 10 beads
= 37 ÷ 10
= 3 r 7
Cost of 30 beads
= 3 x 85
= $255
Cost of 7 beads
= 7 x 9
= $63
Cost of 37 beads
= 255 + 63
= $318
Answer(s): (a) $85; (b) $148; (c) $318