1 sticker costs $9.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 15 stickers cost?
- How much do 34 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 9 - 3
= 90 - 3
= $87
(b)
Number of stickers that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 9
= $45
Cost of 15 stickers
= 87 + 45
= $132
(c)
Number of sets of 10 stickers
= 34 ÷ 10
= 3 r 4
Cost of 30 stickers
= 3 x 87
= $261
Cost of 4 stickers
= 4 x 9
= $36
Cost of 34 stickers
= 261 + 36
= $297
Answer(s): (a) $87; (b) $132; (c) $297