1 sticker costs $5.
For every 10 stickers bought, a discount of $3 is given.
- How much do 10 stickers cost?
- How much do 13 stickers cost?
- How much do 37 stickers cost?
(a)
Cost of every 10 stickers
= 10 x 5 - 3
= 50 - 3
= $47
(b)
Number of stickers that do not belong to a set
= 13 ÷ 10
= 1 r 3
Cost of the 3 extra stickers
= 3 x 5
= $15
Cost of 13 stickers
= 47 + 15
= $62
(c)
Number of sets of 10 stickers
= 37 ÷ 10
= 3 r 7
Cost of 30 stickers
= 3 x 47
= $141
Cost of 7 stickers
= 7 x 5
= $35
Cost of 37 stickers
= 141 + 35
= $176
Answer(s): (a) $47; (b) $62; (c) $176