1 sticker costs $9.
For every 10 stickers bought, a discount of $6 is given.
- How much do 10 stickers cost?
- How much do 18 stickers cost?
- How much do 34 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 9 - 6
= 90 - 6
= $84
(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
= 84 + 72
= $156
(c)
Number of sets of 10 stickers
= 34 ÷ 10
= 3 r 4
Cost of 30 stickers
= 3 x 84
= $252
Cost of 4 stickers
= 4 x 9
= $36
Cost of 34 stickers
= 252 + 36
= $288
Answer(s): (a) $84; (b) $156; (c) $288