1 sticker costs $3.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 15 stickers cost?
- How much do 22 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 3 - 5
= 30 - 5
= $25
(b)
Number of stickers that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 3
= $15
Cost of 15 stickers
= 25 + 15
= $40
(c)
Number of sets of 10 stickers
= 22 ÷ 10
= 2 r 2
Cost of 20 stickers
= 2 x 25
= $50
Cost of 2 stickers
= 2 x 3
= $6
Cost of 22 stickers
= 50 + 6
= $56
Answer(s): (a) $25; (b) $40; (c) $56