Last year, sales at a book store increased from $5,000 to $10,000. this year, sales decreased to $5,000 from $10,000. what percentage did sales increase last year? what percentage did sales decrease this year? sales increased last year, from $5,000 to $10,000. when sales dropped from $10,000 to $5,000 this year, sales decreased .

increase
a. 25%
50%
75%
100%

decrease
b. 25%
50%
75%
100%

Step-by-step explanation:

Formula

Where

change in value = Final value - initial value.

First find out the percentage of sales incresre from  $5,000 to $10,000.

As given

Last year, sales at a book store increased from $5,000 to $10,000.

Final value = $10000

initial value = $5000

change in value = $10000 - $5000

                           =$5000

Put in the formula

Percentage = 100%

Sales increased 100% last year, from $5,000 to $10,000.

Second find out the percentage of sale decrease to $5,000 from $10,000.

As given

This year, sales decreased to $5,000 from $10,000.

Final value =  $5000

Initial value = $10000

Change in value =  $5000 - $10000

                           = - $5000

(This negative sign shows the decrease percentage.)

Put in the formula

Decrease Percentage = 50%

When sales dropped from $10,000 to $5,000 this year, sales decreased 50% .

4th option is correct xy=-10

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