1 sticker costs $3.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 14 stickers cost?
- How much do 25 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 3 - 3
= 30 - 3
= $27
(b)
Number of stickers that do not belong to a set
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra stickers
= 4 x 3
= $12
Cost of 14 stickers
= 27 + 12
= $39
(c)
Number of sets of 10 stickers
= 25 ÷ 10
= 2 r 5
Cost of 20 stickers
= 2 x 27
= $54
Cost of 5 stickers
= 5 x 3
= $15
Cost of 25 stickers
= 54 + 15
= $69
Answer(s): (a) $27; (b) $39; (c) $69