1 sticker costs $4.
For every 10 stickers bought, a discount of $7 is given.
- How much do 10 stickers cost?
- How much do 16 stickers cost?
- How much do 26 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 4 - 7
= 40 - 7
= $33
(b)
Number of stickers that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra stickers
= 6 x 4
= $24
Cost of 16 stickers
= 33 + 24
= $57
(c)
Number of sets of 10 stickers
= 26 ÷ 10
= 2 r 6
Cost of 20 stickers
= 2 x 33
= $66
Cost of 6 stickers
= 6 x 4
= $24
Cost of 26 stickers
= 66 + 24
= $90
Answer(s): (a) $33; (b) $57; (c) $90