1 sticker costs $5.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 17 stickers cost?
- How much do 22 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 5 - 5
= 50 - 5
= $45
(b)
Number of stickers that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra stickers
= 7 x 5
= $35
Cost of 17 stickers
= 45 + 35
= $80
(c)
Number of sets of 10 stickers
= 22 ÷ 10
= 2 r 2
Cost of 20 stickers
= 2 x 45
= $90
Cost of 2 stickers
= 2 x 5
= $10
Cost of 22 stickers
= 90 + 10
= $100
Answer(s): (a) $45; (b) $80; (c) $100