1 sticker costs $4.
For every 10 stickers bought, a discount of $7 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 - 7
= 40 - 7
= $33
(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
= 33 + 20
= $53
(c)
Number of sets of 10 stickers
= 36 ÷ 10
= 3 r 6
Cost of 30 stickers
= 3 x 33
= $99
Cost of 6 stickers
= 6 x 4
= $24
Cost of 36 stickers
= 99 + 24
= $123
Answer(s): (a) $33; (b) $53; (c) $123