1 sticker costs $4.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 17 stickers cost?
- How much do 37 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 4 - 5
= 40 - 5
= $35
(b)
Number of stickers that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra stickers
= 7 x 4
= $28
Cost of 17 stickers
= 35 + 28
= $63
(c)
Number of sets of 10 stickers
= 37 ÷ 10
= 3 r 7
Cost of 30 stickers
= 3 x 35
= $105
Cost of 7 stickers
= 7 x 4
= $28
Cost of 37 stickers
= 105 + 28
= $133
Answer(s): (a) $35; (b) $63; (c) $133