Adam pays $2.00 for a sticker and a marble.
The sticker costs 9 times as much as the marble.
- What is the cost of 1 sticker?
- How much is the cost of 3 marbles and 4 stickers?
(a)
Cost of a marble = 1 u
Cost of a sticker = 9 u
Total cost of a marble and a sticker
= 1 u + 9 u
= 10 u
10 u = 2.00
1 u = 2.00 ÷ 10 = 0.20
Cost of the sticker
= 9 u
= 9 x 0.20
= $1.80
(b)
Cost of 3 marbles and 4 stickers
= 3 x 1 u + 4 x 9 u
= 3 u + 36 u
= 39 u
= 39 x 0.20
= $7.80
Answer(s): (a) $1.80; (b) $7.80