1 sticker costs $6.
For every 10 stickers bought, a discount of $6 is given.
- How much do 10 stickers cost?
- How much do 16 stickers cost?
- How much do 25 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 6 - 6
= 60 - 6
= $54
(b)
Number of stickers that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra stickers
= 6 x 6
= $36
Cost of 16 stickers
= 54 + 36
= $90
(c)
Number of sets of 10 stickers
= 25 ÷ 10
= 2 r 5
Cost of 20 stickers
= 2 x 54
= $108
Cost of 5 stickers
= 5 x 6
= $30
Cost of 25 stickers
= 108 + 30
= $138
Answer(s): (a) $54; (b) $90; (c) $138