1 sticker costs $9.
For every 10 stickers bought, a discount of $6 is given.
- How much do 10 stickers cost?
- How much do 14 stickers cost?
- How much do 31 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
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra stickers
= 4 x 9
= $36
Cost of 14 stickers
= 84 + 36
= $120
(c)
Number of sets of 10 stickers
= 31 ÷ 10
= 3 r 1
Cost of 30 stickers
= 3 x 84
= $252
Cost of 1 stickers
= 1 x 9
= $9
Cost of 31 stickers
= 252 + 9
= $261
Answer(s): (a) $84; (b) $120; (c) $261