After being marked down 20 percent, a calculator sell for $10. The original selling price was

Options

A. 20
B. 12.5
C. 12
D. 9

Answer

To find the original selling price of the calculator after a 20% markdown that resulted in a selling price of $10, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Problem**:
The calculator was marked down by 20%, which means the selling price of $10 represents 80% of the original price (100% - 20% = 80%).

2. **Set Up the Equation**:
Let the original price be denoted as \( P \). According to the problem, we can write the equation:
\[ 0.8P = 10 \]

3. **Solve for the Original Price**:
To find \( P \), we need to isolate it. We can do this by dividing both sides of the equation by 0.8:
\[ P = \frac{10}{0.8} \]

4. **Calculate the Value**:
Now, perform the division:
\[ P = \frac{10}{0.8} = 12.5 \]

5. **Conclusion**:
Therefore, the original selling price of the calculator is \( P = 12.5 \).

### Final Answer:
The original selling price of the calculator was **$12.50**.