1 sticker costs $9.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 18 stickers cost?
- How much do 27 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 9 - 5
= 90 - 5
= $85
(b)
Number of stickers that do not belong to a set
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra stickers
= 8 x 9
= $72
Cost of 18 stickers
= 85 + 72
= $157
(c)
Number of sets of 10 stickers
= 27 ÷ 10
= 2 r 7
Cost of 20 stickers
= 2 x 85
= $170
Cost of 7 stickers
= 7 x 9
= $63
Cost of 27 stickers
= 170 + 63
= $233
Answer(s): (a) $85; (b) $157; (c) $233