1 sticker costs $6.
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 28 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 6 - 5
= 60 - 5
= $55
(b)
Number of stickers that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 6
= $30
Cost of 15 stickers
= 55 + 30
= $85
(c)
Number of sets of 10 stickers
= 28 ÷ 10
= 2 r 8
Cost of 20 stickers
= 2 x 55
= $110
Cost of 8 stickers
= 8 x 6
= $48
Cost of 28 stickers
= 110 + 48
= $158
Answer(s): (a) $55; (b) $85; (c) $158