Question

Percent transmittance is the percent of light that passes through an object. If 780 watts per square meter (W/m²) of light strike the roof of a greenhouse, and the roof has an 85% transmittance, how many W/m² of light pass through the roof?

Answer 1

Using proportions, it is found that 663 W/m² of light passes through the roof.

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• Percentage problems can be solved by proportions, using rule of three.
• The amount that strikes the roof, of 780 W/m², is 100% = 1.
• The amount that passes through is x, which is 85%, due to the transmittance.

The rule of three is:

780 W/m² - 1

x W/m² - 0.85

Applying cross multiplication:

$x = 0.85(780) = 663$

663 W/m² of light passes through the roof.

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