1 sticker costs $9.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 17 stickers cost?
- How much do 32 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
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra stickers
= 7 x 9
= $63
Cost of 17 stickers
= 87 + 63
= $150
(c)
Number of sets of 10 stickers
= 32 ÷ 10
= 3 r 2
Cost of 30 stickers
= 3 x 87
= $261
Cost of 2 stickers
= 2 x 9
= $18
Cost of 32 stickers
= 261 + 18
= $279
Answer(s): (a) $87; (b) $150; (c) $279