Adam pays $4.00 for a sticker and a marble.
The sticker costs 4 times as much as the marble.
- What is the cost of 1 sticker?
- How much is the cost of 4 marbles and 3 stickers?
(a)
Cost of a marble = 1 u
Cost of a sticker = 4 u
Total cost of a marble and a sticker
= 1 u + 4 u
= 5 u
5 u = 4.00
1 u = 4.00 ÷ 5 = 0.80
Cost of the sticker
= 4 u
= 4 x 0.80
= $3.20
(b)
Cost of 4 marbles and 3 stickers
= 4 x 1 u + 3 x 4 u
= 4 u + 12 u
= 16 u
= 16 x 0.80
= $12.80
Answer(s): (a) $3.20; (b) $12.80