The formula to calculate the overall VLT is:
\[ \text{Overall VLT} = \left( \frac{\text{Glass VLT}}{100} \right) \times \left( \frac{\text{Tint VLT}}{100} \right) \times 100 \]
Overall Visible Light Transmission (VLT) is the percentage of visible light that passes through a combination of tinted materials. It is calculated by multiplying the VLT of each material.
Let's assume the following values:
Step 1: Convert to decimals:
\[ \text{Glass VLT} = 0.70 \quad \text{and} \quad \text{Tint VLT} = 0.80 \]
Step 2: Multiply the decimals:
\[ \text{Overall VLT} = 0.70 \times 0.80 = 0.56 \]
Step 3: Convert back to percentage:
\[ \text{Overall VLT} = 0.56 \times 100 = 56\% \]
Therefore, the overall VLT is 56%, and the overall tint is 44%.