1 sticker costs $8.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 18 stickers cost?
- How much do 22 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 3
= 80 - 3
= $77
(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
= 77 + 64
= $141
(c)
Number of sets of 10 stickers
= 22 ÷ 10
= 2 r 2
Cost of 20 stickers
= 2 x 77
= $154
Cost of 2 stickers
= 2 x 8
= $16
Cost of 22 stickers
= 154 + 16
= $170
Answer(s): (a) $77; (b) $141; (c) $170