Question

How do you calculate percent of change( i forgot Lol)

Answer 1

See below.

Explanation:

The following example will illustrate the method:

Suppose the cost of a car was $10,000 and it increased to $10,500 the following year. Calculate the percent increase in the cost,

The percent increase is based on the original price 10,000 so it is

(the difference in cost / original cost) * 100

= [(10,500 - 10,000) / 10,000] * 100

= (500/ 10,000) * 100

= 0.05 * 100

= 5 %.

Answer 2

To calculate a change in something, you subtract. Example: going from 7 to 3 is a drop of 4 since 7-3 = 4. So we say "change of 4".

The percent change of going from 7 to 3 is a drop of 4/7 = 0.5714 = 57.14% approximately. If you had 7 dollars, and you lost 57.14% of those 7 dollars, then you'd have 3 dollars roughly.

Note how taking 57.14% of 7 yields us: 0.5714*7 = 3.9998 and which is fairly close to the result of 4 we got earlier.

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So what I did with that example was

step 1) subtract the two values: 7-3 = 4

step 2) divide the result of step 1 over the starting value 7 to get 4/7 = 57.14%

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In general, the formula is

C = [ (B-A)/A ] * 100

where,

A = starting value

B = final value

C = percent change

If the value of C is positive, then you have a percent increase. If C is negative, then you have a percent decrease.

Put another way: if A > B, then theres a percent decrease. If A < B, then we have a percent increase.

The "100" tacked on at the end is to convert from decimal form to percent form. Eg: 0.37 converts to 37% after multiplying by 100