1 bead costs $7.
For every 10 beads bought, a discount of $7 is given.
- How much do 10 beads cost?
- How much do 14 beads cost?
- How much do 31 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
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra beads
= 4 x 7
= $28
Cost of 14 beads
= 63 + 28
= $91
(c)
Number of sets of 10 beads
= 31 ÷ 10
= 3 r 1
Cost of 30 beads
= 3 x 63
= $189
Cost of 1 beads
= 1 x 7
= $7
Cost of 31 beads
= 189 + 7
= $196
Answer(s): (a) $63; (b) $91; (c) $196