1 sticker costs $7.
For every 10 stickers bought, a discount of $6 is given.
- How much do 10 stickers cost?
- How much do 18 stickers cost?
- How much do 28 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 7 - 6
= 70 - 6
= $64
(b)
Number of stickers that do not belong to a set
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra stickers
= 8 x 7
= $56
Cost of 18 stickers
= 64 + 56
= $120
(c)
Number of sets of 10 stickers
= 28 ÷ 10
= 2 r 8
Cost of 20 stickers
= 2 x 64
= $128
Cost of 8 stickers
= 8 x 7
= $56
Cost of 28 stickers
= 128 + 56
= $184
Answer(s): (a) $64; (b) $120; (c) $184