1 sticker costs $9.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 16 stickers cost?
- How much do 33 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
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra stickers
= 6 x 9
= $54
Cost of 16 stickers
= 87 + 54
= $141
(c)
Number of sets of 10 stickers
= 33 ÷ 10
= 3 r 3
Cost of 30 stickers
= 3 x 87
= $261
Cost of 3 stickers
= 3 x 9
= $27
Cost of 33 stickers
= 261 + 27
= $288
Answer(s): (a) $87; (b) $141; (c) $288