1 bead costs $6.
For every 10 beads bought, a discount of $4 is given.
- How much do 10 beads cost?
- How much do 17 beads cost?
- How much do 25 beads cost?
(a)
Cost of every 10 beads
= 10 x 6 - 4
= 60 - 4
= $56
(b)
Number of beads that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra beads
= 7 x 6
= $42
Cost of 17 beads
= 56 + 42
= $98
(c)
Number of sets of 10 beads
= 25 ÷ 10
= 2 r 5
Cost of 20 beads
= 2 x 56
= $112
Cost of 5 beads
= 5 x 6
= $30
Cost of 25 beads
= 112 + 30
= $142
Answer(s): (a) $56; (b) $98; (c) $142