1 sticker costs $7.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 12 stickers cost?
- How much do 27 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 7 - 5
= 70 - 5
= $65
(b)
Number of stickers that do not belong to a set
= 12 ÷ 10
= 1 r 2
Cost of the 2 extra stickers
= 2 x 7
= $14
Cost of 12 stickers
= 65 + 14
= $79
(c)
Number of sets of 10 stickers
= 27 ÷ 10
= 2 r 7
Cost of 20 stickers
= 2 x 65
= $130
Cost of 7 stickers
= 7 x 7
= $49
Cost of 27 stickers
= 130 + 49
= $179
Answer(s): (a) $65; (b) $79; (c) $179