1 bead costs $7.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 13 beads cost?
- How much do 33 beads cost?
(a)
Cost of every 10 beads
= 10 x 7 - 7
= 70 - 7
= $63
(b)
Number of beads that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra beads
= 3 x 7
= $21
Cost of 13 beads
= 63 + 21
= $84
(c)
Number of sets of 10 beads
= 33 ÷ 10
= 3 r 3
Cost of 30 beads
= 3 x 63
= $189
Cost of 3 beads
= 3 x 7
= $21
Cost of 33 beads
= 189 + 21
= $210
Answer(s): (a) $63; (b) $84; (c) $210