1 sticker costs $9.
For every 10 stickers bought, a discount of $4 is given.
- How much do 10 stickers cost?
- How much do 13 stickers cost?
- How much do 24 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
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra stickers
= 3 x 9
= $27
Cost of 13 stickers
= 86 + 27
= $113
(c)
Number of sets of 10 stickers
= 24 ÷ 10
= 2 r 4
Cost of 20 stickers
= 2 x 86
= $172
Cost of 4 stickers
= 4 x 9
= $36
Cost of 24 stickers
= 172 + 36
= $208
Answer(s): (a) $86; (b) $113; (c) $208