1 sticker costs $6.
For every 10 stickers bought, a discount of $7 is given.
- How much do 10 stickers cost?
- How much do 13 stickers cost?
- How much do 28 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 6 - 7
= 60 - 7
= $53
(b)
Number of stickers that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra stickers
= 3 x 6
= $18
Cost of 13 stickers
= 53 + 18
= $71
(c)
Number of sets of 10 stickers
= 28 ÷ 10
= 2 r 8
Cost of 20 stickers
= 2 x 53
= $106
Cost of 8 stickers
= 8 x 6
= $48
Cost of 28 stickers
= 106 + 48
= $154
Answer(s): (a) $53; (b) $71; (c) $154