math NEED HELP!

How did the temperature change if it increased by 25 % and then decreased by 40% ?

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  1. I changed percentages to decimals.

    1.25 -.40 = ?

    1.00 - ? = ??

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  2. Let x be the starting temperature.
    y=1.25x
    z=y-.4y=1.25x-.4(1.25x)=.75x

    So the final temperature is 75% of the original temperature.

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