1 bead costs $8.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 19 beads cost?
- How much do 37 beads cost?
(a)
Cost of every 10 beads
= 10 x 8 - 7
= 80 - 7
= $73
(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
= 73 + 72
= $145
(c)
Number of sets of 10 beads
= 37 ÷ 10
= 3 r 7
Cost of 30 beads
= 3 x 73
= $219
Cost of 7 beads
= 7 x 8
= $56
Cost of 37 beads
= 219 + 56
= $275
Answer(s): (a) $73; (b) $145; (c) $275