1 sticker costs $9.
For every 10 stickers bought, a discount of $7 is given.
- How much do 10 stickers cost?
- How much do 14 stickers cost?
- How much do 25 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 9 - 7
= 90 - 7
= $83
(b)
Number of stickers that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra stickers
= 4 x 9
= $36
Cost of 14 stickers
= 83 + 36
= $119
(c)
Number of sets of 10 stickers
= 25 ÷ 10
= 2 r 5
Cost of 20 stickers
= 2 x 83
= $166
Cost of 5 stickers
= 5 x 9
= $45
Cost of 25 stickers
= 166 + 45
= $211
Answer(s): (a) $83; (b) $119; (c) $211