On Monday, the pollen count was 320 grains per cubic meter. On Tuesday, the pollen count was 15% less. What was the pollen count on Tuesday?

Answer 1

The pollen count on Tuesday was 272 grains per cubic meter.

The formula for calculating the percent change is #p = (N - O)/O * 100# where #p# is the percent change, #N# is the new value and #O# is the old value. Substituting what we know gives:

#-15 = (N - 320)/320 * 100#

Solving for #N# gives:

#-15/100 = (N - 320)/320#

#(-15 * 320) / 100 = N - 320#

#-4800 / 100 = N - 320#

#-48 = N - 320#

#320 - 48 = N#

#N = 272#

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Answer 2

Avery Alexander

The pollen count on Tuesday was 272 grains per cubic meter.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.