1 bead costs $8.
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 39 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
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra beads
= 3 x 8
= $24
Cost of 13 beads
= 75 + 24
= $99
(c)
Number of sets of 10 beads
= 39 ÷ 10
= 3 r 9
Cost of 30 beads
= 3 x 75
= $225
Cost of 9 beads
= 9 x 8
= $72
Cost of 39 beads
= 225 + 72
= $297
Answer(s): (a) $75; (b) $99; (c) $297