1 sticker costs $7.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 15 stickers cost?
- How much do 32 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 7 - 5
= 70 - 5
= $65
(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
= 65 + 35
= $100
(c)
Number of sets of 10 stickers
= 32 ÷ 10
= 3 r 2
Cost of 30 stickers
= 3 x 65
= $195
Cost of 2 stickers
= 2 x 7
= $14
Cost of 32 stickers
= 195 + 14
= $209
Answer(s): (a) $65; (b) $100; (c) $209