1 sticker costs $4.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 13 stickers cost?
- How much do 34 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 4 - 3
= 40 - 3
= $37
(b)
Number of stickers that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra stickers
= 3 x 4
= $12
Cost of 13 stickers
= 37 + 12
= $49
(c)
Number of sets of 10 stickers
= 34 ÷ 10
= 3 r 4
Cost of 30 stickers
= 3 x 37
= $111
Cost of 4 stickers
= 4 x 4
= $16
Cost of 34 stickers
= 111 + 16
= $127
Answer(s): (a) $37; (b) $49; (c) $127