1 bead costs $3.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 13 beads cost?
- How much do 34 beads cost?
(a)
Cost of every 10 beads
= 10 x 3 - 5
= 30 - 5
= $25
(b)
Number of beads that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra beads
= 3 x 3
= $9
Cost of 13 beads
= 25 + 9
= $34
(c)
Number of sets of 10 beads
= 34 ÷ 10
= 3 r 4
Cost of 30 beads
= 3 x 25
= $75
Cost of 4 beads
= 4 x 3
= $12
Cost of 34 beads
= 75 + 12
= $87
Answer(s): (a) $25; (b) $34; (c) $87