1 bead costs $5.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 14 beads cost?
- How much do 37 beads cost?
(a)
Cost of every 10 beads
= 10 x 5 - 7
= 50 - 7
= $43
(b)
Number of beads that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra beads
= 4 x 5
= $20
Cost of 14 beads
= 43 + 20
= $63
(c)
Number of sets of 10 beads
= 37 ÷ 10
= 3 r 7
Cost of 30 beads
= 3 x 43
= $129
Cost of 7 beads
= 7 x 5
= $35
Cost of 37 beads
= 129 + 35
= $164
Answer(s): (a) $43; (b) $63; (c) $164