1 bead costs $5.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 19 beads cost?
- How much do 29 beads cost?
(a)
Cost of every 10 beads
= 10 x 5 - 4
= 50 - 4
= $46
(b)
Number of beads that do not belong to a set
= 19 ÷ 10
= 1 r 9
Cost of the 9 extra beads
= 9 x 5
= $45
Cost of 19 beads
= 46 + 45
= $91
(c)
Number of sets of 10 beads
= 29 ÷ 10
= 2 r 9
Cost of 20 beads
= 2 x 46
= $92
Cost of 9 beads
= 9 x 5
= $45
Cost of 29 beads
= 92 + 45
= $137
Answer(s): (a) $46; (b) $91; (c) $137