1 sticker costs $8.
For every 10 stickers bought, a discount of $6 is given.
- How much do 10 stickers cost?
- How much do 15 stickers cost?
- How much do 31 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 6
= 80 - 6
= $74
(b)
Number of stickers that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 8
= $40
Cost of 15 stickers
= 74 + 40
= $114
(c)
Number of sets of 10 stickers
= 31 ÷ 10
= 3 r 1
Cost of 30 stickers
= 3 x 74
= $222
Cost of 1 stickers
= 1 x 8
= $8
Cost of 31 stickers
= 222 + 8
= $230
Answer(s): (a) $74; (b) $114; (c) $230