Answer: -37%
Step by Step Sol: 100=x
10% of 100 equals 10
100-10 = 90
30% of 90 equals 27
90-27 = 63
63-100 equals -37
The temperature decreased by 37% if the temperature changed if; at first it decreased by 10%.
It's the ratio of two integers stated as a fraction of a hundred parts. It is a metric for comparing two sets of data, and it is expressed as a percentage using the percent symbol.
We have:
The temperature change if; at first, it decreased by 10 % and then decreased by 30%
Let x be the initial temperature
= (100 - 10) = 90% (first it decreased by 10%)
= 90% of x
= 0.90x
Then decrease by 30 percent,
= 100 - 30 = 70%
= (0 .90x)× 0.70
= 0.63x
The original percentage left 63%
= 100 - 63 = 37
Thus, the temperature decreased by 37% if the temperature changed if; at first it decreased by 10%.
Learn more about the percentage here:
brainly.com/question/8011401
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