1 bead costs $5.
For every 10 beads bought, a discount of $3 is given.
- How much do 10 beads cost?
- How much do 17 beads cost?
- How much do 32 beads cost?
(a)
Cost of every 10 beads
= 10 x 5 - 3
= 50 - 3
= $47
(b)
Number of beads that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra beads
= 7 x 5
= $35
Cost of 17 beads
= 47 + 35
= $82
(c)
Number of sets of 10 beads
= 32 ÷ 10
= 3 r 2
Cost of 30 beads
= 3 x 47
= $141
Cost of 2 beads
= 2 x 5
= $10
Cost of 32 beads
= 141 + 10
= $151
Answer(s): (a) $47; (b) $82; (c) $151