1 sticker costs $8.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 13 stickers cost?
- How much do 25 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 3
= 80 - 3
= $77
(b)
Number of stickers that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra stickers
= 3 x 8
= $24
Cost of 13 stickers
= 77 + 24
= $101
(c)
Number of sets of 10 stickers
= 25 ÷ 10
= 2 r 5
Cost of 20 stickers
= 2 x 77
= $154
Cost of 5 stickers
= 5 x 8
= $40
Cost of 25 stickers
= 154 + 40
= $194
Answer(s): (a) $77; (b) $101; (c) $194