1 bead costs $8.
For every 10 beads bought, a discount of $5 is given.
- How much do 10 beads cost?
- How much do 19 beads cost?
- How much do 23 beads cost?
(a)
Cost of every 10 beads
= 10 x 8 - 5
= 80 - 5
= $75
(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
= 75 + 72
= $147
(c)
Number of sets of 10 beads
= 23 ÷ 10
= 2 r 3
Cost of 20 beads
= 2 x 75
= $150
Cost of 3 beads
= 3 x 8
= $24
Cost of 23 beads
= 150 + 24
= $174
Answer(s): (a) $75; (b) $147; (c) $174