1 sticker costs $8.
For every 10 stickers bought, a discount of $7 is given.
- How much do 10 stickers cost?
- How much do 19 stickers cost?
- How much do 28 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 8 - 7
= 80 - 7
= $73
(b)
Number of stickers that do not belong to a set
= 19 ÷ 10
= 1 r 9
Cost of the 9 extra stickers
= 9 x 8
= $72
Cost of 19 stickers
= 73 + 72
= $145
(c)
Number of sets of 10 stickers
= 28 ÷ 10
= 2 r 8
Cost of 20 stickers
= 2 x 73
= $146
Cost of 8 stickers
= 8 x 8
= $64
Cost of 28 stickers
= 146 + 64
= $210
Answer(s): (a) $73; (b) $145; (c) $210