1 sticker costs $8.
For every 10 stickers bought, a discount of $4 is given.
- How much do 10 stickers cost?
- How much do 14 stickers cost?
- How much do 21 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
= 14 ÷ 10
= 1 r 4
Cost of the 4 extra stickers
= 4 x 8
= $32
Cost of 14 stickers
= 76 + 32
= $108
(c)
Number of sets of 10 stickers
= 21 ÷ 10
= 2 r 1
Cost of 20 stickers
= 2 x 76
= $152
Cost of 1 stickers
= 1 x 8
= $8
Cost of 21 stickers
= 152 + 8
= $160
Answer(s): (a) $76; (b) $108; (c) $160