1 sticker costs $7.
For every 10 stickers bought, a discount of $4 is given.
- How much do 10 stickers cost?
- How much do 15 stickers cost?
- How much do 38 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 7 - 4
= 70 - 4
= $66
(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
= 66 + 35
= $101
(c)
Number of sets of 10 stickers
= 38 ÷ 10
= 3 r 8
Cost of 30 stickers
= 3 x 66
= $198
Cost of 8 stickers
= 8 x 7
= $56
Cost of 38 stickers
= 198 + 56
= $254
Answer(s): (a) $66; (b) $101; (c) $254