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31 votes
31 votes
The temperature dropped from 90° at noon to 50° by midnight. What is the percent decrease in temperature

Round your answer to the nearest whole percent and include your percent sign,

User Stackdisplay
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2 Answers

22 votes
22 votes
  • Initial temperature=t_i=90°C
  • Final temperature=t_f=50°C

Total change in temperature

  • ∆T=90-50=40°C

Percentage:-


\\ \sf\longmapsto (\Delta T)/(t_i)* 100


\\ \sf\longmapsto (40)/(90)* 100


\\ \sf\longmapsto (400)/(9)


\\ \sf\longmapsto 44.4\%

User Mellester
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2.8k points
6 votes
6 votes
Percent decrease
= [(90-50) / 90 ] x 100%
= (40 / 90) x 100%
= 44.4%
= 44%
User Ebolyen
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3.4k points