1 sticker costs $3.
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 32 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 3 - 6
= 30 - 6
= $24
(b)
Number of stickers that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 3
= $15
Cost of 15 stickers
= 24 + 15
= $39
(c)
Number of sets of 10 stickers
= 32 ÷ 10
= 3 r 2
Cost of 30 stickers
= 3 x 24
= $72
Cost of 2 stickers
= 2 x 3
= $6
Cost of 32 stickers
= 72 + 6
= $78
Answer(s): (a) $24; (b) $39; (c) $78