1 sticker costs $5.
For every 10 stickers bought, a discount of $7 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 5 - 7
= 50 - 7
= $43
(b)
Number of stickers that do not belong to a set
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra stickers
= 8 x 5
= $40
Cost of 18 stickers
= 43 + 40
= $83
(c)
Number of sets of 10 stickers
= 22 ÷ 10
= 2 r 2
Cost of 20 stickers
= 2 x 43
= $86
Cost of 2 stickers
= 2 x 5
= $10
Cost of 22 stickers
= 86 + 10
= $96
Answer(s): (a) $43; (b) $83; (c) $96