1 sticker costs $3.
For every 10 stickers bought, a discount of $7 is given.
- How much do 10 stickers cost?
- How much do 14 stickers cost?
- How much do 34 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 3 - 7
= 30 - 7
= $23
(b)
Number of stickers that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra stickers
= 4 x 3
= $12
Cost of 14 stickers
= 23 + 12
= $35
(c)
Number of sets of 10 stickers
= 34 ÷ 10
= 3 r 4
Cost of 30 stickers
= 3 x 23
= $69
Cost of 4 stickers
= 4 x 3
= $12
Cost of 34 stickers
= 69 + 12
= $81
Answer(s): (a) $23; (b) $35; (c) $81