1 sticker costs $8.
For every 10 stickers bought, a discount of $7 is given.
- How much do 10 stickers cost?
- How much do 17 stickers cost?
- How much do 39 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 7
= 80 - 7
= $73
(b)
Number of stickers that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra stickers
= 7 x 8
= $56
Cost of 17 stickers
= 73 + 56
= $129
(c)
Number of sets of 10 stickers
= 39 ÷ 10
= 3 r 9
Cost of 30 stickers
= 3 x 73
= $219
Cost of 9 stickers
= 9 x 8
= $72
Cost of 39 stickers
= 219 + 72
= $291
Answer(s): (a) $73; (b) $129; (c) $291