Question

If the cost of 200 mL of soft drink is $2, then what is the cost of 1 L of soft drink?

• A. $4
• B. $8
• C. $10
• D. $12

Answer 1

The correct option is C $10

Ratio of quantity to its cost is constant.
We know, 1 L = 1000 mL

Let $x$ be the price of 1 L of coke.

Therefore, $\frac{200}{2}$ = $\frac{1000}{x}$

$\therefore x=\frac{1000\times 20}{200}=\$10$