1 sticker costs $9.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 19 stickers cost?
- How much do 22 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 9 - 5
= 90 - 5
= $85
(b)
Number of stickers that do not belong to a set
= 19 ÷ 10
= 1 r 9
Cost of the 9 extra stickers
= 9 x 9
= $81
Cost of 19 stickers
= 85 + 81
= $166
(c)
Number of sets of 10 stickers
= 22 ÷ 10
= 2 r 2
Cost of 20 stickers
= 2 x 85
= $170
Cost of 2 stickers
= 2 x 9
= $18
Cost of 22 stickers
= 170 + 18
= $188
Answer(s): (a) $85; (b) $166; (c) $188