Question

Which is the best estimate for the number of minutes on the calling card advertised below?

$\begin{array}{l}A)10\min \\ B)20\min \\ C)50\min \\ D)200\min \end{array}$

Short answer

The correct option is $D)200\min$.

Step-by-step solution

Step 1. Determine the total amount and rate.

The total amount is $10 and rate is $5.4$cents per minute.

Step 2. Write the equation.

Let the maximum number of minutes is represented by x.

The given expression can be written as:

$x=\frac{10\left(100\right)}{5.4}$

Step 3. Solve for x.

$\begin{array}{l}x=\frac{1000}{5.4}\\ x=185.185\end{array}$

Hence, the maximum number of minutes can be$185.185$

Therefore, the correct option is $D)200\min$.