1 sticker costs $4.
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 36 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
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 4
= $20
Cost of 15 stickers
= 35 + 20
= $55
(c)
Number of sets of 10 stickers
= 36 ÷ 10
= 3 r 6
Cost of 30 stickers
= 3 x 35
= $105
Cost of 6 stickers
= 6 x 4
= $24
Cost of 36 stickers
= 105 + 24
= $129
Answer(s): (a) $35; (b) $55; (c) $129