1 sticker costs $3.
For every 10 stickers bought, a discount of $4 is given.
- How much do 10 stickers cost?
- How much do 17 stickers cost?
- How much do 35 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 3 - 4
= 30 - 4
= $26
(b)
Number of stickers that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra stickers
= 7 x 3
= $21
Cost of 17 stickers
= 26 + 21
= $47
(c)
Number of sets of 10 stickers
= 35 ÷ 10
= 3 r 5
Cost of 30 stickers
= 3 x 26
= $78
Cost of 5 stickers
= 5 x 3
= $15
Cost of 35 stickers
= 78 + 15
= $93
Answer(s): (a) $26; (b) $47; (c) $93