1 sticker costs $5.
For every 10 stickers bought, a discount of $5 is given.
- How much do 10 stickers cost?
- How much do 16 stickers cost?
- How much do 32 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 5 - 5
= 50 - 5
= $45
(b)
Number of stickers that do not belong to a set
= 16 ÷ 10
= 1 r 6
Cost of the 6 extra stickers
= 6 x 5
= $30
Cost of 16 stickers
= 45 + 30
= $75
(c)
Number of sets of 10 stickers
= 32 ÷ 10
= 3 r 2
Cost of 30 stickers
= 3 x 45
= $135
Cost of 2 stickers
= 2 x 5
= $10
Cost of 32 stickers
= 135 + 10
= $145
Answer(s): (a) $45; (b) $75; (c) $145