1 sticker costs $5.
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 24 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 5 - 5
= 50 - 5
= $45
(b)
Number of stickers that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 5
= $25
Cost of 15 stickers
= 45 + 25
= $70
(c)
Number of sets of 10 stickers
= 24 ÷ 10
= 2 r 4
Cost of 20 stickers
= 2 x 45
= $90
Cost of 4 stickers
= 4 x 5
= $20
Cost of 24 stickers
= 90 + 20
= $110
Answer(s): (a) $45; (b) $70; (c) $110