1 bead costs $8.
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 36 beads cost?
(a)
Cost of every 10 beads
= 10 x 8 - 4
= 80 - 4
= $76
(b)
Number of beads that do not belong to a set
= 19 ÷ 10
= 1 r 9
Cost of the 9 extra beads
= 9 x 8
= $72
Cost of 19 beads
= 76 + 72
= $148
(c)
Number of sets of 10 beads
= 36 ÷ 10
= 3 r 6
Cost of 30 beads
= 3 x 76
= $228
Cost of 6 beads
= 6 x 8
= $48
Cost of 36 beads
= 228 + 48
= $276
Answer(s): (a) $76; (b) $148; (c) $276