1 sticker costs $9.
For every 10 stickers bought, a discount of $4 is given.
- How much do 10 stickers cost?
- How much do 14 stickers cost?
- How much do 38 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 9 - 4
= 90 - 4
= $86
(b)
Number of stickers that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra stickers
= 4 x 9
= $36
Cost of 14 stickers
= 86 + 36
= $122
(c)
Number of sets of 10 stickers
= 38 ÷ 10
= 3 r 8
Cost of 30 stickers
= 3 x 86
= $258
Cost of 8 stickers
= 8 x 9
= $72
Cost of 38 stickers
= 258 + 72
= $330
Answer(s): (a) $86; (b) $122; (c) $330