1 sticker costs $8.
For every 10 stickers bought, a discount of $6 is given.
- How much do 10 stickers cost?
- How much do 18 stickers cost?
- How much do 39 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 6
= 80 - 6
= $74
(b)
Number of stickers that do not belong to a set
= 18 ÷ 10
= 1 r 8
Cost of the 8 extra stickers
= 8 x 8
= $64
Cost of 18 stickers
= 74 + 64
= $138
(c)
Number of sets of 10 stickers
= 39 ÷ 10
= 3 r 9
Cost of 30 stickers
= 3 x 74
= $222
Cost of 9 stickers
= 9 x 8
= $72
Cost of 39 stickers
= 222 + 72
= $294
Answer(s): (a) $74; (b) $138; (c) $294