1 sticker costs $8.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 18 stickers cost?
- How much do 27 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 5
= 80 - 5
= $75
(b)
Number of stickers that do not belong to a set
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra stickers
= 8 x 8
= $64
Cost of 18 stickers
= 75 + 64
= $139
(c)
Number of sets of 10 stickers
= 27 ÷ 10
= 2 r 7
Cost of 20 stickers
= 2 x 75
= $150
Cost of 7 stickers
= 7 x 8
= $56
Cost of 27 stickers
= 150 + 56
= $206
Answer(s): (a) $75; (b) $139; (c) $206