1 sticker costs $3.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 12 stickers cost?
- How much do 23 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 3 - 5
= 30 - 5
= $25
(b)
Number of stickers that do not belong to a set
= 12 ÷ 10
= 1 r 2
Cost of the 2 extra stickers
= 2 x 3
= $6
Cost of 12 stickers
= 25 + 6
= $31
(c)
Number of sets of 10 stickers
= 23 ÷ 10
= 2 r 3
Cost of 20 stickers
= 2 x 25
= $50
Cost of 3 stickers
= 3 x 3
= $9
Cost of 23 stickers
= 50 + 9
= $59
Answer(s): (a) $25; (b) $31; (c) $59