Adam pays $1.80 for a sticker and a marble.
The sticker costs 8 times as much as the marble.
- What is the cost of 1 sticker?
- How much is the cost of 2 marbles and 5 stickers?
(a)
Cost of a marble = 1 u
Cost of a sticker = 8 u
Total cost of a marble and a sticker
= 1 u + 8 u
= 9 u
9 u = 1.80
1 u = 1.80 ÷ 9 = 0.20
Cost of the sticker
= 8 u
= 8 x 0.20
= $1.60
(b)
Cost of 2 marbles and 5 stickers
= 2 x 1 u + 5 x 8 u
= 2 u + 40 u
= 42 u
= 42 x 0.20
= $8.40
Answer(s): (a) $1.60; (b) $8.40