1 sticker costs $8.
For every 10 stickers bought, a discount of $4 is given.
- How much do 10 stickers cost?
- How much do 13 stickers cost?
- How much do 39 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 4
= 80 - 4
= $76
(b)
Number of stickers that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra stickers
= 3 x 8
= $24
Cost of 13 stickers
= 76 + 24
= $100
(c)
Number of sets of 10 stickers
= 39 ÷ 10
= 3 r 9
Cost of 30 stickers
= 3 x 76
= $228
Cost of 9 stickers
= 9 x 8
= $72
Cost of 39 stickers
= 228 + 72
= $300
Answer(s): (a) $76; (b) $100; (c) $300