1 sticker costs $4.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 16 stickers cost?
- How much do 22 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 4 - 5
= 40 - 5
= $35
(b)
Number of stickers that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra stickers
= 6 x 4
= $24
Cost of 16 stickers
= 35 + 24
= $59
(c)
Number of sets of 10 stickers
= 22 ÷ 10
= 2 r 2
Cost of 20 stickers
= 2 x 35
= $70
Cost of 2 stickers
= 2 x 4
= $8
Cost of 22 stickers
= 70 + 8
= $78
Answer(s): (a) $35; (b) $59; (c) $78