A sheet of plastic stops 25% of the light and lets through the residual 75%.

What percentage of the light is let through by two sheets of the plastic ?

.75 * .75

50

To determine the percentage of light that is let through by two sheets of the plastic, we can multiply the percentage of light transmitted by each sheet.

Given that one sheet of plastic stops 25% of the light and allows 75% to pass through, we can calculate the percentage of light that is let through by two sheets as follows:

First, we calculate the percentage of light that is stopped by one sheet:
100% - 25% = 75%

Next, we calculate the percentage of light that is let through by two sheets by multiplying the percentage of light let through by one sheet twice:
75% * 75% = 56.25%

Therefore, two sheets of the plastic let through 56.25% of the light.