1 bead costs $5.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 15 beads cost?
- How much do 32 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
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra beads
= 5 x 5
= $25
Cost of 15 beads
= 43 + 25
= $68
(c)
Number of sets of 10 beads
= 32 ÷ 10
= 3 r 2
Cost of 30 beads
= 3 x 43
= $129
Cost of 2 beads
= 2 x 5
= $10
Cost of 32 beads
= 129 + 10
= $139
Answer(s): (a) $43; (b) $68; (c) $139