1 sticker costs $3.
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 3 - 3
= 30 - 3
= $27
(b)
Number of stickers that do not belong to a set
= 17 ÷ 10
= 1 r 7
Cost of the 7 extra stickers
= 7 x 3
= $21
Cost of 17 stickers
= 27 + 21
= $48
(c)
Number of sets of 10 stickers
= 32 ÷ 10
= 3 r 2
Cost of 30 stickers
= 3 x 27
= $81
Cost of 2 stickers
= 2 x 3
= $6
Cost of 32 stickers
= 81 + 6
= $87
Answer(s): (a) $27; (b) $48; (c) $87