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 38 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
= 38 ÷ 10
= 3 r 8
Cost of 30 stickers
= 3 x 25
= $75
Cost of 8 stickers
= 8 x 3
= $24
Cost of 38 stickers
= 75 + 24
= $99
Answer(s): (a) $25; (b) $31; (c) $99