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 36 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
= 36 ÷ 10
= 3 r 6
Cost of 30 stickers
= 3 x 43
= $129
Cost of 6 stickers
= 6 x 5
= $30
Cost of 36 stickers
= 129 + 30
= $159
Answer(s): (a) $43; (b) $83; (c) $159