1 sticker costs $6.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 19 stickers cost?
- How much do 33 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 6 - 3
= 60 - 3
= $57
(b)
Number of stickers that do not belong to a set
= 19 ÷ 10
= 1 r 9
Cost of the 9 extra stickers
= 9 x 6
= $54
Cost of 19 stickers
= 57 + 54
= $111
(c)
Number of sets of 10 stickers
= 33 ÷ 10
= 3 r 3
Cost of 30 stickers
= 3 x 57
= $171
Cost of 3 stickers
= 3 x 6
= $18
Cost of 33 stickers
= 171 + 18
= $189
Answer(s): (a) $57; (b) $111; (c) $189