1 bead costs $5.
For every 10 beads bought, a discount of $3 is given.
- How much do 10 beads cost?
- How much do 18 beads cost?
- How much do 29 beads cost?
(a)
Cost of every 10 beads
= 10 x 5 - 3
= 50 - 3
= $47
(b)
Number of beads that do not belong to a set
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra beads
= 8 x 5
= $40
Cost of 18 beads
= 47 + 40
= $87
(c)
Number of sets of 10 beads
= 29 ÷ 10
= 2 r 9
Cost of 20 beads
= 2 x 47
= $94
Cost of 9 beads
= 9 x 5
= $45
Cost of 29 beads
= 94 + 45
= $139
Answer(s): (a) $47; (b) $87; (c) $139