1 sticker costs $7.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 15 stickers cost?
- How much do 22 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 7 - 3
= 70 - 3
= $67
(b)
Number of stickers that do not belong to a set
= 15 ÷ 10
= 1 r 5
Cost of the 5 extra stickers
= 5 x 7
= $35
Cost of 15 stickers
= 67 + 35
= $102
(c)
Number of sets of 10 stickers
= 22 ÷ 10
= 2 r 2
Cost of 20 stickers
= 2 x 67
= $134
Cost of 2 stickers
= 2 x 7
= $14
Cost of 22 stickers
= 134 + 14
= $148
Answer(s): (a) $67; (b) $102; (c) $148