1 sticker costs $3.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 12 stickers cost?
- How much do 24 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 3 - 3
= 30 - 3
= $27
(b)
Number of stickers that do not belong to a set
= 12 ÷ 10
= 1 r 2
Cost of the 2 extra stickers
= 2 x 3
= $6
Cost of 12 stickers
= 27 + 6
= $33
(c)
Number of sets of 10 stickers
= 24 ÷ 10
= 2 r 4
Cost of 20 stickers
= 2 x 27
= $54
Cost of 4 stickers
= 4 x 3
= $12
Cost of 24 stickers
= 54 + 12
= $66
Answer(s): (a) $27; (b) $33; (c) $66