1 sticker costs $5.
For every 10 stickers bought, a discount of $6 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 5 - 6
= 50 - 6
= $44
(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
= 44 + 25
= $69
(c)
Number of sets of 10 stickers
= 28 ÷ 10
= 2 r 8
Cost of 20 stickers
= 2 x 44
= $88
Cost of 8 stickers
= 8 x 5
= $40
Cost of 28 stickers
= 88 + 40
= $128
Answer(s): (a) $44; (b) $69; (c) $128