1 bead costs $6.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 13 beads cost?
- How much do 38 beads cost?
(a)
Cost of every 10 beads
= 10 x 6 - 7
= 60 - 7
= $53
(b)
Number of beads that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra beads
= 3 x 6
= $18
Cost of 13 beads
= 53 + 18
= $71
(c)
Number of sets of 10 beads
= 38 ÷ 10
= 3 r 8
Cost of 30 beads
= 3 x 53
= $159
Cost of 8 beads
= 8 x 6
= $48
Cost of 38 beads
= 159 + 48
= $207
Answer(s): (a) $53; (b) $71; (c) $207